The average of prime numbers between 1 and 20 is-

A. 9

B. $$9\frac{5}{8}$$

C. $$10\frac{1}{8}$$

D. 8

Answer: Option B

Solution(By Examveda Team)

The prime number between 1 and 20 is 2, 3, 5, 7, 11, 13, 17, 19
∴ Required average
$$\eqalign{ & = \frac{{{\text{sum of prime numbers}}}}{8} \cr & = \frac{{2 + 3 + 5 + 7 + 11 + 13 + 17 + 19}}{8} \cr & = \frac{{77}}{8} \cr & = 9\frac{5}{8} \cr} $$