A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

madhu.mukherjee.946

  • one year ago

calculate the arithmetic mean: age group: 14-15 16-17 18-20 21-24 25-29 30-34 35-39 no.of wage earners: 60 140 150 110 110 100 90

  • This Question is Closed
  1. madhu.mukherjee.946
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    its difficult to calculate the mid value here coz the common difference is changing

  2. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    hmm don't we hve to add all the numbers and divide by the number of numbers

  3. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    tag ganeshie8 or freckles

  4. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    @madhu.mukherjee.946

  5. madhu.mukherjee.946
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @ganeshie8 @freckles

  6. freckles
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    @Nnesha is right

  7. freckles
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    just add the numbers and divide by the number of numbers

  8. madhu.mukherjee.946
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    no in group frequency we don't solve it like that way

  9. freckles
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    oh I see the mid value is just the sum of endpoints and that result divided by 2

  10. freckles
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    for example: \[\frac{14+15}{2}=\frac{29}{2}=14.5\]

  11. freckles
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    so x_1=14.5 and f_1=60 x_1*f_1=14.5*60

  12. freckles
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    \[\text{ mean }=\frac{x_1 f_1 +x_2 f_2 +x_3 f_3+x_4f_4+x_5f_5+x_6f_6+x_7f_7}{f_1+f_2+f_3+f_4+f_5+f_6+f_7} \\ \]

  13. freckles
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    at least that is my definition of midpoint http://www.yale.edu/ynhti/curriculum/units/1986/5/86.05.03.x.html here they pick the midpoint of 99 to 100 as 98 which is odd because that is not the midpoint of 99 to 100

  14. madhu.mukherjee.946
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thank you so much

  15. freckles
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    @madhu.mukherjee.946 still trying to figure out how to pick h |dw:1440874552930:dw| so I think I will choose a to be that thingy there because it looks like they are picking a to be one of the "middle numbers" and we only have one middle here since we have an odd amount of data entries do you ever seen this method? And do you know how to pick h?

  16. freckles
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    |dw:1440874856438:dw|

  17. freckles
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    the next column involves the h value and I'm still trying to find out how they picked in the last example or two

  18. freckles
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    I guess we can just see what happens if we pick h to be 2

  19. freckles
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    |dw:1440875337918:dw|