Find mean by step – deviation method:

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Solution

Here, $A = 87.50$ and $h = 7$
$¯ x = A + h \times \frac{\sum f_{i} u_{i}}{\sum f_{i}} = 87.5 + 7 \times \frac{29}{150} = 87.5 + 1.35 = 88.85$

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Find mean by step – deviation method:

Here, A=87.50 and h=7¯x=A+h×∑fiui∑fi=87.5+7×29150=87.5+1.35=88.85

Here, $A = 87.50$ and $h = 7$
$¯ x = A + h \times \frac{\sum f_{i} u_{i}}{\sum f_{i}} = 87.5 + 7 \times \frac{29}{150} = 87.5 + 1.35 = 88.85$