Question

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Ye wala pad kaise nikale​

Answer 1

♂️ Σ $f_{i}$ denotes the sum of all the frequencies of all the class boundaries respectively.

♂️ Hence, Σ $f_{i}$ = 4+5+12+2+2 = 25

♂️ $x_{i}$ for each class boundary is the mid-value of that class boundary.