Question

5) Find the mean by step deviation method.
of class and frequency
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Answer 1

Answer:

We know that the direct method of finding the mean of classified data gives

Mean A = ∑mifi∑fi

where m1, m2, m3, m4, ……, mn are the class marks of the class intervals and f1, f2, f3, f4, …….., fn are the frequencies of the corresponding classes