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Q.

What is the average of first $4$ prime numbers?

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a

4

b

4.25

c

5

d

6.25

answer is B.

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Detailed Solution

It is given to find the average of the first 4 prime numbers.
The first 4 prime numbers are 2, 3, 5, and 7.
The formula of average is

= \frac{Sum of observations}{Number of observations}

.
On substituting the numbers in the formula, we get

= \frac{2 + 3 + 5 + 7}{4}

= \frac{17}{4}

= 4.25

Thus, the average of the first 4 prime numbers is 4.25.
Therefore, the correct option is 2.

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