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Question

find the mean
c.i. 0-50 50-100 100-150 150-200 200-250 250-300
f 17 35 43 40 21 24

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Solution

Dear student
Class Interval Frequency fi Mid-values xi di=xi-A ui=dih fiui
0-50 17 25 -100 -2 -34
50-100 35 75 -50 -1 -35
100-150 43 125 0 0 0
150-200 40 175 50 1 40
200-250 21 225 100 2 42
250-300 24 275 150 3 72
N=fi=180 fiui=85

Here, N=180, A=125 ,h=50Therefore, Mean=A+h1Nfiui=125+5085180=125+23.61=148.61
Regards

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