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Q.

The arithmetic mean of 6,10, x and 12 is 8 The value of x is

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a

3

b

4

c

5

d

6  

answer is B.

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Detailed Solution

Given observations are 6, 10, x , 12 and their mean is 8.
We know that mean=sum of observationsnumber of observations.
Substituting given values,
⇒8=6+10+x+124 ⇒32=6+10+x+12 ⇒x=32-28 ⇒x=4 Hence, required solution is x=4.
Hence, option 2 is correct.
 
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