Question

Age Frequency Midpoint f*M f*(M-xbar)2 30-39 2 40-49 3 50-59 7 60-69 5 70-79 1 Compute...

Age Frequency Midpoint f*M f*(M-xbar)2
30-39 2
40-49 3
50-59 7
60-69 5
70-79 1

Compute the Coefficient of Variation to 2 decimal places.

Do NOT format answer: No $, Commas, %.

Homework Answers

Answer #1

Mean:

Xbar =

Midpoint = (Upper Class limit + Lower class limit) / 2

For First Class:

Midpoint = (30+39)/2 = 34.5

Similarly, solve for other classess...

Computational table:

Age Frequency (f) Midpoint (M)    f*M f*(M-xbar)2   
30-39 2 =(30+39)/2 = 34.5 69 800
40-49 3 =(40+49)/2 = 44.5 133.5 300
50-59 7 =(50+59)/2 = 54.5 381.5 0
60-69 5 =(60+69)/2 = 64.5 322.5 500
70-79 1 =(70+79)/2 = 74.5 74.5 400
Total 18 981 2000

standard deviation (S):

Coefficient of variation (CV):

CV = (S/)*100

CV = (10.54 / 54.5)

CV = 0.19

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