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Six faces of a balanced die are numbered from integers 1 to 6. This die is tossed 60 times and the frequency distribution of the integers obtained is given below. Then the mean of the grouped data is
Integer 1 2 3 4 5 6
Frequency 8 9 10 16 9 8

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3.25

3.55

3.45

3.35

answer is B.

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Detailed Solution

$\vec{x} = \sum_{i = 1}^{n} f_{i} x_{i} / \sum_{i = 1}^{n} f_{i}$

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