Question

D Frequency 2. Find the mean of the following data: assume mean method Class Interval
0-50 50-100 100-150 150-200 200-250 Frequency 15 20 35 20 10​

Answer 1

Answer is 132.5

Take the Class mark of the class interval

Class mark means mid value of a class interval

Assume a mean from the class mark

A = Assumed Mean = 125

Subtract the Class mark with the assumed mean that column will be (di)

Multiply the frequency (fi) with (di) this column will be (fidi)

Take total of this column which will be sigma (fidi)= 750

Take total of the (fi) column which will be sigma (fi)= 100

Mean = A + Sigma (fidi)

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Sigma (fi)