Question

Find the mean of all prime numbers between $20$ and $40$

Answer 1

Finding the mean of all prime numbers between $20$ and $40$

The prime number between $20$ and $40$ are $23,29,31,37$

Sum of prime numbers $=23+29+31+37$

$=120$

The total prime number between $20$ and $40$ $=4$

Therefore,

Required mean $=\frac{Sumofprimenumbers}{Totalnumber}$

$$\begin{gathered} =\frac{120}{4} \\ =30 \end{gathered}$$

Hence, the required mean is $30$