multiplied by $3$ and then divided by $2.$

12

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24

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18

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30

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Solution

The correct option is D $18$
The given observations are : $8, 12, 16, 10, 22, 4$
multiplying each observation by $3$ and the dividing each observation by $2$ , we get: $12, 18, 24, 15, 33, 6$
Mean $=$ $\frac{S u m}{N u m b e r o f o b s e r v a t i o n s}$
Mean $=$ $\frac{12 + 18 + 24 + 15 + 33 + 6}{6}$ $=$ $\frac{108}{6}$ $=$ $18$

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