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Question

Find the mean (arithmetic of following frequency distribution
$x$ 2 5 7 9 11
$f$ 1 5 4 7 3

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Solution

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Table of A.M.
Thus, arithmetic mean $(¯ x) = \frac{\sum f_{i} x_{i}}{\sum f_{i}} = \frac{151}{20} = 7.55$
Thus, required A.M. = 7.55

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