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Consider the frequency distribution
value 1 2 3 4 5
frequency 4 5 Y 1 2
If the mean is known to be 2.6 , then the value of y is

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answer is C.

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Detailed Solution

$\bar{x} = \frac{\sum f_{i} x_{i}}{\sum f_{i}} = 2.6$

$\frac{28 + 3 y}{12 + y} = 2.6 \Rightarrow y = 8$

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