Question

find the mean of the following data using assumed mean method...​

Answer 1

Refer The Attachment ⬆️

✒️ Mid Value is calculated by

$\frac{Lower\; class+Upper\; class}{2}$

☞ $\frac{18+24}{2} = 21$

✒️ $∑fixi$ was calculated by Frequency × Mid Value

☞ 12 × 21 = 252

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