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Arithmetic Mean

In the table ...

Question

In the table given below, Find the mean.
(i)
Class mark Frequency
5 3
15 9
25 15
35 13

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Solution

$f_{i} = 3, 9, 15, 13 \sum f_{i} = 3 + 9 + 15 + 13 = 40 x_{i} = 5, 15, 25, 35 \sum x_{i} f_{i} = 15 + 135 + 375 + 455 = 980 ¯ x = \frac{980}{40} = 24.5$

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