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Direct Method of Finding Mean

The mean of ...

Question

The mean of $3$ observations is $12$ and mean of $5$ observations is $4$ the combined mean is

A

7

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B

8

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C

9

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D

10

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Solution

The correct option is C 7
The no .of observations is $3 + 5 = 8$
The sum of observations is $3 (12) + 5 (4) = 36 + 20 = 56$
The mean is $\frac{56}{8} = 7$

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