If the mean of the distribution is 2.6, then the value of γ is

A
24
B
13
C
8
D
3

Solution:

mean $= \frac{\sum_{i = 1}^{n} f_{i} x_{i}}{\sum_{i = 1}^{n} f_{i}}$
$∴ 2 .6 = \frac{1 \times 4 + 2 \times 5 + 3 \times y + 4 \times 1 + 5 \times 2}{4 + 5 + y + 1 + 2}$
$\begin{array}{l} \Rightarrow 31 .2 + 2 .6 y = 28 + 3 y \\ \Rightarrow 0 .4 y = 3 .2 \\ \Rightarrow y = 8 \end{array}$

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