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Push-Ups!

November16

Mr. Mendelson wants to know how his P.E. classes are improving in the number of push-ups they can do. This graph shows the number of push-ups each student in his 1st period class was able to do last month and this month.

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How much did the mean number of push-ups increase from last month to this month?

117 Comments to

“Push-Ups!”

  1. November 16th, 2014 at 12:08 pm      Reply reneeh2014 Says:

    It didn’t, it decreased by 2.5: 10+10+15+15+25+25+25+35=160 /8=20 (last months mean:20). 10+15+25+30+30+30+40+40=220 /8=17.5 (this months mean:17.5)


  2. November 16th, 2014 at 5:53 pm      Reply Tristin weber Says:

    The difference between the first month and the second months average was 7.5 push-ups


  3. November 16th, 2014 at 6:10 pm      Reply brandonw2014 Says:

    The average last month was 20 push ups. this month it was 27.5 pushups. There for the mean increased this month by 7 pushups.


  4. November 17th, 2014 at 8:28 am      Reply jimenai2014 Says:

    The number of push-ups increased by
    7.5 between last month and this month.
    I got this by adding all of the #s from last month, and dividing them by 8 and got 20 and did the same with this month also and got 27.5
    and subtracted them both and that’s how i got 7.5.


  5. November 17th, 2014 at 8:31 am      Reply alexam2014 Says:

    The number of push-ups in 1period class did beetwen this month and last month is 7.5 becuase you add all the numders then divid dy how maney numders there are and i got 20 for the last month .For this month igot 27.5 becuase you do the same thing.the differnts is 7.5.


  6. November 17th, 2014 at 3:10 pm      Reply colev2014 Says:

    The mean of push-ups for last month was 20 and this months mean was 27 1/2 so that means that it increased 7 1/2 push-ups done.


  7. November 17th, 2014 at 3:19 pm      Reply dustinr2014 Says:

    the mean number of push-ups increased by 7.


  8. November 17th, 2014 at 3:20 pm      Reply sydneyb2014 Says:

    so, we do 10+10+15+15+25+25+25+35 because you have to add all the numbers up as a first step to solving the average. 10+10+15+15+25+25+25+35= 140
    next, you divide the sum (140) by the number of students.
    140/8= 17.5
    you follow the same procedure for the next data table.

    10+15+25+30+30+30+40+40=220

    220/8=27.5
    to find how much the average of push ups increased, you find the difference…i think.
    27.5 10.0 can just be simplified to 10, so the push up mean
    -17.5 increased by 10.
    ——-
    10.0
    haha im in PE


  9. November 17th, 2014 at 6:44 pm      Reply rachelre2014 Says:

    the mean number of pushups increased by 7 because i add the first months number of pushups and it totalled 160 which I then divided by 8 students. The answer was 20. I did then same for this month and it totaled 220 which i divided by 8 and got 27.4. The difference is about 7 pushups.


  10. November 17th, 2014 at 8:04 pm      Reply jordynd2014 Says:

    it goes up by 25.3125 because if you add all the numbers in over all you get 405 then divide it by 16 and you get 25.3125


  11. November 17th, 2014 at 8:59 pm      Reply emmabr2014 Says:

    so, the mean of the number of push ups did increase from last month to this month. if you look very closely at the graphs you can see obviously that the mean of the number of push ups increases five push ups from last month to this month. you can see in the first graph that only one person did 35 push ups and in the second graph you can see that a few people did 45 push ups which is way better than one. so this is why I think that the answer is five


  12. November 18th, 2014 at 5:50 am      Reply Katiesa2014 Says:

    So last month the mean of the number of push ups students could do is 20. 10+10+15+15+25+25+25+35=160/8=20
    (8=how many numbers there are)
    This month the mean of the number of push ups students could do is 27.5. 10+15+25+30+30+30+40+40=220/8=27.5
    (8=how many numbers there are)
    So the mean number of push ups increased from last month to this month is 7.5


  13. November 18th, 2014 at 1:25 pm      Reply jadalynnv2014 Says:

    because it increced at least two times and there is now more 25 then 30


  14. November 18th, 2014 at 1:25 pm      Reply saulr2014 Says:

    the push ups only increase two times and know there only a lot more


  15. November 18th, 2014 at 4:07 pm      Reply BrandonM 2014 Says:

    Push ups last month was on average was 2. The number of push ups this month was 1.6 . So push ups went down buy 1.6 push ups


  16. November 18th, 2014 at 4:09 pm      Reply landonc2014 Says:

    I got the mean of both numbers 20 and 48 and subtracted them to get 28


  17. November 18th, 2014 at 4:34 pm      Reply audram2014 Says:

    The mean number of push up that increased from last month to this month is 16


  18. November 18th, 2014 at 5:25 pm      Reply citlallym2014 Says:

    The mean increased by 7.5 pushups. To find my i answer first i found the mean of the first month and got 20. Then i found the mean for the second number and got 27.5. Last i subtracted the first and second means and got 7.5 push-ups as my final answer.


  19. November 18th, 2014 at 5:50 pm      Reply ericv2014 Says:

    i add 10 twice and 15 twice added 25 three times and added 35 ones and got 160. Then I divided 8 160 and got 20. then with the other set I added once and then added 15 once then I added 25 once then I added 30 three times then I added 40 twice and got 220 divided by 8 and got 27.5 and I subtracted and got 7.5 as my answer.


  20. November 19th, 2014 at 11:21 am      Reply cameronj2014 Says:

    135 divided by 8 = 14


  21. November 19th, 2014 at 12:57 pm      Reply keltons2014 Says:

    the number of push up that increase from last mouth to this mouth is 70 because you would subtract the 220-150=70 and you can check by adding 150+70 and you would get 70


    • November 30th, 2014 at 11:01 am      Reply ajellison Says:

      Remember, to find the mean of a set of data, you add up all the values and then divide by how many values you have.


  22. November 19th, 2014 at 2:08 pm      Reply treya2014 Says:

    The number of push ups increased by 7 adding up all the first month you get 160 and there are 8 numbers and 160 divided by 8 is 20. For month 2 adding up all the numbers you get 220. There 8 numbers and 220 divided by 8 is bout 27.


  23. November 19th, 2014 at 2:27 pm      Reply lisbeth fernando Says:

    Mr Mendelson is p.e class has improve,push-ups last month is class did do, push-ups for inc25,10,and15 who increase and this year is yous 30 and 40 push-ups


  24. November 19th, 2014 at 3:01 pm      Reply turiea2014 Says:

    my answer is 60


  25. November 19th, 2014 at 3:12 pm      Reply Jason Bietz Says:

    30 push ups


  26. November 19th, 2014 at 3:21 pm      Reply jaydinw2014 Says:

    for last month it was 20 but for this month they can do 27.5


  27. November 19th, 2014 at 3:39 pm      Reply jeanettem2014 Says:

    it increased by 35 more push-ups because last month there highest was 35 and the highest of this month is 40 ,and the second highest of last month was 25 while the second highest of this month is 30 so when you count the last months and this months push-ups altogether, this month has 35 more push-ups than the last month


  28. November 19th, 2014 at 4:16 pm      Reply rainf2014 Says:

    none because the mean for the first graph is 8 and the mean for the second graph is 8


    • November 30th, 2014 at 10:58 am      Reply ajellison Says:

      How did you find the mean for each of the graphs? Does it make sense that if the data is changing the mean would stay the same?


  29. November 19th, 2014 at 5:26 pm      Reply shyannw2014 Says:

    The mean of the number of pushups increased from last month by 25. I got this by adding up the number in last and all thr numbers in this month and divided this month’s amount whick was 220 by 8 and I got 25


  30. November 20th, 2014 at 11:58 am      Reply alexsisb2014 Says:

    The mean for the first month was 20 and the second month was 27.5.It increased by 7.5.


  31. November 20th, 2014 at 2:53 pm      Reply teah2014 Says:

    In last month they did not do well in push ups and all the total of push ups was 160, and the mean for it would be 20 because there are 8 student and 160 divided by 8 is 20. In this month the students did better in their push ups and the total of push ups was 220 and the mean for its is 27.5, so in this month the students did better than last month. The End.


  32. November 20th, 2014 at 3:02 pm      Reply walterm2014 Says:

    P.E 1st period has increased in push ups 5.5 after a month. Last month, an average 20 push ups was done per child. A month later, the class has increased on average 25.5 push ups per child. So I subtracted 25.5 with 20 and got 5.5. Therefore on average the class has increased 5.5 push ups more.

    Why is there 8 kids in a P.E class?


  33. November 20th, 2014 at 3:03 pm      Reply makaylag2014 Says:

    So in the first month the mean is 20 because I added the total of pushup which was 160 and divided it by the number 8 since there are 8 students and got 20. The 2nd month it is 27.5 since the number of pushup was 220 and there was 8 students so divided 220 by 8 and got 27.5 Finally I subtracted 27.5 and 20 and got 7.5 so the increase is 7.5 pushup s total.


  34. November 20th, 2014 at 4:05 pm      Reply rheond2014 Says:

    the mean increased by 7.5 because when i added all the numbers in the 1st month got 160 then i divided 160 by 8 and got 20 then i added all the numbers in the 2nd month and got 220 then i divided by 8 and got 27.5. after i took 27.5 and 20 then i subtracted them together and got a remainder of 7.5.


  35. November 20th, 2014 at 4:12 pm      Reply benjamind2014 Says:

    The number of push-ups has increased by 5 in the past month.


  36. November 20th, 2014 at 4:27 pm      Reply michelleca2014 Says:

    I think the answer is for 10 it went up by 2 and 15 went down by 1 and 35 went down


  37. November 20th, 2014 at 5:10 pm      Reply chasen2014 Says:

    The mean increased by 7.5. Last month the class did a total of 160 push-ups and I divided that by 8 and got 20. This month the class did a total of 220 push-ups and I divided by 8 and got 27.5. So the mean increased by 7.5.


  38. November 20th, 2014 at 5:13 pm      Reply jiannav2014 Says:

    I’m going to assume that one dot = one student…

    The mean number of push-ups increased by 7.5 from last month to this month.
    First, I found the mean of the number of push-ups last month by adding all the numbers together, the total was 160, then I divided it by the number of students which was 8. 160 divided by 8 is 20.
    Then, I found the mean number of push-ups this month by doing the same thing. I added all the numbers together, the total this time was 220, then I divided 220 by the number of students, 8, 220 divided by 8 is 27.5.
    Lastly, to find out the amount of the increase, I subtracted 27.5 – 20 = 7.5
    The mean number of push ups increased by 7.5 from last month to this month


  39. November 20th, 2014 at 5:35 pm      Reply samanthabo2014 Says:

    LAST MONTH: THIS MONTH: So the mean of last months
    10 10 push up count was about
    10 15 16.
    15 25
    15 30 This months push up
    25 30 count was about 28.
    25 30
    25 40 So the difference is about
    35 40 12 push ups.
    Samantha B.


  40. November 20th, 2014 at 5:35 pm      Reply madisono2014 Says:

    the answer is 7.5 because the mean of last month is 20 and for this month it is 27.5 so when you subtract those two you get the answer of 7.5 is how much it increased since last month.


  41. November 20th, 2014 at 5:46 pm      Reply haileyb2014 Says:

    The mean number of pushups increased by 7.5.


  42. November 20th, 2014 at 6:11 pm      Reply josiasp2014 Says:

    the mean number of pushups increased by 7.5, first I added all the push ups from the first month, which turned out to be 160, then added all the students, so 160 divided by 8 is 20. then I looked at the second month and added them together which was 220, so the total number of students is 8, 220 divided by 8 is 27.5, so the 2 averages subtracted together is 7.5


  43. November 20th, 2014 at 6:18 pm      Reply skylarr2014 Says:

    27.5 – 20 =7.5 pushups


  44. November 20th, 2014 at 6:19 pm      Reply katarinam2014 Says:

    I found the mean of thr first group by adding all the push ups together that they could do which added up to be 160 total divided by the 8 students which equals 20.
    The mean of the second group was 220 total pushups divided by the 8 students which equals 27.5
    That shows me that the mean pushuos increased by 7.5


  45. November 20th, 2014 at 6:41 pm      Reply maleal2014 Says:

    I found the mean of the number of pushups last month and got 20. I then found the mean of pushups from this month and got 27.5. So the number of pushups increased from this month to last month was 7.5.


  46. November 20th, 2014 at 6:47 pm      Reply kevina2014 Says:

    The number of push-ups increased bye 7.5 because I found the mean by adding every number and then i divided it by the number of the numbers there where. For example in push-up last month I added all the numbers and then I divided them bye 8 and I did the same for the number of push-ups this month and for last month so the mean for the last month was 20 and the mean for the number of push-ups for this month was 27.5.


  47. November 20th, 2014 at 7:00 pm      Reply julianm2014 Says:

    In the last month the mean was about 23 or 24, while this month the mean is 26, so the mean went up by 2 or 3


  48. November 20th, 2014 at 7:06 pm      Reply Susy Torres Says:

    The mean number of push-ups increased by 4 from last month to this month. All that I did to figure this out was first find the mean for the first month. To do that first i multiplied 30 times 3=90,15 times 2=30,10times2=20, and 35 times 1=35. I added all of those numbers and it equalled 160. Then i divided 160 into 4 because there was 4 numbers that i added and that equaled 40. Then i had to find the mean for this month. To do that i multiplied 30times3=90, 40times2=80,25times1=25, 15times1=15, and 10times1=10. I added all of those numbers and it equalled 220 then i divided 220 into 5 because there was 5 numbers i added it equaled 44. Lastly to find the answer i subtracted 44 minus 40 =4. So the answer is 4.


  49. November 20th, 2014 at 7:35 pm      Reply kennedym2014 Says:

    His class improved with 7.5 more push-ups in a month. This is how I did my work. I added the first months push up ratings and got 160 then divided it by eight which was the number of students who did it and go 20. I did the same thing on the month after raiting and got 27.5.


  50. November 20th, 2014 at 8:06 pm      Reply danield2014 Says:

    Last month’s mean ( 10+15+25+35=85 push-ups divided by 8 , the mean is 10.63. ) This month the mean is ( 10+15+25+30+40=120 push-ups divided by 8 , the mean is 15. So, that means that each student is a able to do 4.37 push ups more than the month before.


  51. November 20th, 2014 at 8:38 pm      Reply allysonb2014 Says:

    The mean number of push ups increased by 7.5 because you add up all the number of push ups from last month which equals 160 and divide it by how many numbers you have and you which is 8 so 160\8 equals 20 so 20 is your mean from last month then you do this months mean so you add up all the numbers and your total is 220 then you divid it by how many numbers you have so 8 then 220/8 equals 27.5 so thats your mean for this month then you subtract both means from both months and you get 7.5 so the increase from last month and this month is 7.5


  52. November 20th, 2014 at 9:02 pm      Reply jaquelinev2014 Says:

    The mean number of push-ups increased by 7.5. First I try to find the mean of both months of push-ups then I got 20 for last month and 27.5 for this month. Than I finally subtracted 27.5 – 20 and got 7.5. So the answer is 7.5.


  53. November 20th, 2014 at 9:04 pm      Reply angeli2014 Says:

    It increased by 7.5 push ups. I got this by doing 10+15+25+90+80 and got 220 so then I divided it by 8 and got 27.5 then I did 20+30+75+35 and got 160 so then I divided it by 8 and got 20. Then I subtracted 27.5 – 20 and got 7.5!


  54. November 20th, 2014 at 10:23 pm      Reply kateenaa2014 Says:

    The mean of last month is 20 because I added all the numbers and then I divided the total by 8. The mean of this month’s is 27.5 because I added all the numbers and divided the total by 8. So this tell me that the number of push ups from this month increase by 7.5 from last month’s pushups.


  55. November 21st, 2014 at 2:50 pm      Reply jasminb2014 Says:

    The mean number of pushups increased by 60 from last month to this month.


  56. November 21st, 2014 at 8:57 pm      Reply graciea2014 Says:

    The number of push-ups increased from last month to this month by 7.5.
    How I got 7.5 is first I found the mean of last months push-ups by multiplying the number of dots times the number below the dot(s). After that I added the number of dots total. Then I divided the first number and second, then got 20. I did the same thing for the number of push-ups this month and got 27.5. I subtracted 27.5-20 and t got 7.5.


  57. November 22nd, 2014 at 9:47 am      Reply jasminm2014 Says:

    The mean number of push-ups increased by 7.5.
    I got my answer by adding the data from each graph and then dividing the answer I got by the number of data there is which was 8. And i got 20. I did the exact same thing to the other graph and I got 27.5. So i just subtract 27.5 by 20 and got 7.5. Thats how I got my answer .

    20 27.5


  58. November 22nd, 2014 at 11:28 am      Reply julianac2014 Says:

    The mean number of push ups increased by 4 from last month to this month. First I added up all the push ups the students did last month. I got 160. Then I divided it by 4 because it was the amount of pushups they did per day. I got 40. Then I added up all the pushups the students did this month. I got 220. Then I divided it by 5 because that is the amount of push ups they did per day. I got 44. 44-40 is 4, so the number of push ups increased by 4.


  59. November 23rd, 2014 at 7:25 am      Reply dayneo2014 Says:

    It increased by 7 1/2 push ups I found my answer by adding up all the posh ups done and divided it by how kids did that many push ups.


  60. November 23rd, 2014 at 10:02 am      Reply bernicek2014 Says:

    the mean number of students that increased there push-ups in the last month to this month would be 9 students because both from last month and this month , there are 8 push-ups for both month so divided by 2 , I’d get 9 students.


  61. November 23rd, 2014 at 1:22 pm      Reply alyssaj2014 Says:

    The mean changes by 7.5. Because the first mean is 20 and the second mean is 27.5. When u 27.5-20=7.5.


  62. November 23rd, 2014 at 3:04 pm      Reply maisyd2014 Says:

    The mean number for 30 increased by 2 because two more people could do 30 push ups.


  63. November 23rd, 2014 at 8:04 pm      Reply cierrag2014 Says:

    the mean increased by 55 push ups. cause if you add all the push ups from the first month, than add all the push ups from this month, then subtract them, it equals 55


  64. November 24th, 2014 at 6:36 am      Reply elianov2014 Says:

    The mean number of push-ups increased by (7.5) from the last month to this month.

    I got this answerer by adding up the numbers and dividing by 8 then comparing the differences.


  65. November 24th, 2014 at 8:13 am      Reply marial2014 Says:

    the number of the kids improving in his class are 6 beuase only 2 kids didnt improve and they stayed at the same number of push ups and the six kids that did improve moved up to a higher amount of number of push ups!!!!:):):):P


  66. November 24th, 2014 at 8:20 am      Reply ashleight2014 Says:

    +7 because if you count all of the numbers that increased and not minused you would get 7


  67. November 24th, 2014 at 8:21 am      Reply ashleight2014 Says:

    (+5)


  68. November 24th, 2014 at 8:25 am      Reply anasm2014 Says:

    well lets start with ten 2 used to do good until it increased to only 1 the next month.
    on 15 there used to be 2 doing good until the next month now only one is doing good.
    on 20 nobody did twenty during both months.
    on 25 there used to be 3 until there ended up only being on doing 25.
    in 30 it has improved a lot beause first month there was none now there is 3.
    in 35 it increased because in the first month they hd 1 and now they have zero.
    in 40 it im proved because in the first month there was none now there is 2.
    45 dident improve they stayed the same both months zero.


  69. December 1st, 2014 at 7:15 pm      Reply fanel2014 Says:

    I did it an easier way so I did:
    10×2= 20
    15×2= +30
    25×3= 75
    —————–
    160 (then. . .)
    10= 10
    15= 15
    25= +25
    30×3= 90
    40×2= 80
    —————
    220
    then added that up which is 380….thats 15 #’s that added up to that….so then, I got 25.3 continues…The increse would be 60 more push-ups…


  70. December 2nd, 2014 at 8:16 am      Reply alexsandra Says:

    the diffrence is 7.5 push-ups


  71. December 4th, 2014 at 7:45 am      Reply alexanderz2014 Says:

    Last month’s total: 160 pushups
    This month’s total:220 pushups
    so the means are:20 and 20.4! So,…this month has well…MORE!!
    THANK YOU FOR YOUR COMUNICATION!
    NO ENCORES!!!!!!


  72. December 4th, 2014 at 1:30 pm      Reply Consuelo Says:

    The mean increased by 7.5 pushups. To find my i answer first i found the mean of the first month and got 20. Then i found the mean for the second number and got 27.5. Last i subtracted the first and second means and got 7.5 push-ups as my final answerThat how i got my answer Ms.Ellsion.


  73. December 5th, 2014 at 8:39 am      Reply onterioj2014 Says:

    you get 160 becuse its 8 number nd i added 10 two times and 15 once and 25 three times


  74. December 8th, 2014 at 2:44 pm      Reply seans2014 Says:

    the awnser is 30


  75. December 9th, 2014 at 9:30 pm      Reply kaedenh2014 Says:

    The first thing that I did was that I added up last month’s pushup total and I got 160. Then I divided it by 8 because there are 8 students and that’s how I got the mean of 20 pushups. The next thing I did was that I did was I added this month pushup total and I got 220. Then I divided 220 by 8 because there are 8 students and that’s how I got the mean of 27.5 pushups. So the class increased by 7.5 push-ups.


  76. December 10th, 2014 at 6:28 pm      Reply natalied2014 Says:

    You get 30 because its 8 numbers and i added all of them then divided by 8


  77. December 10th, 2014 at 7:09 pm      Reply salotep2014 Says:

    The answer is 7.5 pushups first I found the mean of the two sets of numbers then I found the difference between the two answers of the means and my answer was 7.5 pushups.


  78. December 13th, 2014 at 2:14 pm      Reply kaiw2014 Says:

    the mean increased by 5.


  79. December 13th, 2014 at 5:34 pm      Reply Mason.M Says:

    the mean increased vy 7.5 because when i added all the numbers in the 1st month i got 160 then i divided 160 by 8 and got 20 then i added all the numbers in the 2nd month and got 220 then i divided by 8 and got 27.5. After i took 27.5 and 20 then i subtracted them together and got a remainder of 7.5.


  80. December 16th, 2014 at 5:18 am      Reply lizbethv2014 Says:

    The mean increased by 7.5 push ups. What I did to get my answer is I found the mean for the first month(20), then I found the mean for last month(27.5). So then I subtracted 27.5 and 20 and got 7.5


  81. December 16th, 2014 at 6:30 pm      Reply harrisonw2014 Says:

    the difference between a mean of 20 and a mean of 27.5 is 7.5


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