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Q.

The mean of prime numbers between 20 and 30 is


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a

    21

b

    26

c

    25

d

    27 

answer is B.

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Detailed Solution

Given prime numbers are 20 and 30.
The prime numbers between 20 and 30 are 23,29.
We know that the mean of the data set is the average of values in the data set.
Mean of 23,29 =23+292.
Therefore the mean of the prime numbers =522=26.
Hence, option 2 is correct.
 
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The mean of prime numbers between 20 and 30 is