Question

The mean of all prime numbers between $20$ and $30$is $\_\_\_\_\_\_\_\_\_$

Answer 1

The prime numbers between $20$and $30$are $23,29$

The sum of numbers $=23+29$

$=52$

Number of terms $=2$

We know that,

Mean $=\frac{\mathbf{S}\mathbf{u}\mathbf{m}\mathbf{}\mathbf{o}\mathbf{f}\mathbf{}\mathbf{n}\mathbf{u}\mathbf{m}\mathbf{b}\mathbf{e}\mathbf{r}\mathbf{s}}{\mathbf{N}\mathbf{u}\mathbf{m}\mathbf{b}\mathbf{e}\mathbf{r}\mathbf{}\mathbf{o}\mathbf{f}\mathbf{}\mathbf{t}\mathbf{e}\mathbf{r}\mathbf{m}\mathbf{s}}$

$$\begin{gathered} =\frac{52}{2} \\ =26 \end{gathered}$$

Hence, The mean of all prime numbers between $20$ and $30$is $26$