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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

= \frac{23 + 29}{2}

.
Therefore the mean of the prime numbers

= \frac{52}{2} = 26

.
Hence, option

2

is correct.

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The mean of prime numbers between 20 and 30 is