Question

Find the average of all prime numbers between $30$ and $50.$

• A. $40$
• B. $42$
• C. $39$
• D. $39.8$

Answer 1

The correct option is D $39.8$

There are five prime numbers between 30 and 50
They are $31,37,41,43and47$
$\therefore$ Required average=$\left(\frac{31+37+41+43+47}{5}\right)$
$=\frac{199}{5}=39.8$