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Q.

Find the mean of the first five multiples of 3.


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a

9

b

18

c

15

d

6 

answer is A.

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Detailed Solution

We need to find the mean of the first five multiples of 3.
The first five multiples of 3 are:
3,6,9,12,15
We know that,
Mean=Sum of the observationsNumber of the observations
⇒Mean=3+6+9+12+155
⇒Mean=455
⇒Mean=9
Thus the mean of the given data is 9.
Hence the correct option is 1.
 
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