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If 6, 4, 8 ...

Question

If $6, 4, 8$ and $3$ occur with frequencies $4, 2, 5$ and $1$ respectively, then the arithmetic mean is __________.

A

6.25

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B

6.75

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C

6.5

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D

6

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Solution

The correct option is C $6.25$
Mean $=$ Sum of data $\div$ Cumulative Frequency
Sum $= 6 \times 4 + 4 \times 2 + 8 \times 5 + 3 \times 1 = 75$

$∴$ Mean $= \frac{75}{12} = 6.25$

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