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Q.

The mean of a data is 15 and the sum of the observations is 195. The number of observations is


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a

13

b

19

c

16

d

17 

answer is A.

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Detailed Solution

It is given that the mean of a data is 15 and the sum of the observations is 195. We need to find the number of observations.
We know that,
Mean=Sum of observationsNumber of observations
⇒15=195Number of observations
⇒Number of observations=19515
⇒Number of observations=13
Thus, the number of observations is 13 when the mean of a data is 15 and the sum of the observations is 195.
Hence, the correct option is 1.
 
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