J P Mohindru and Bharat Mohindru Solutions for Chapter: Statistics, Exercise 7: NATIONAL TALENT SEARCH EXAMINATION (NTSE)

If the mean of $x$ and $\frac{1}{x}$ is $m$, then the mean of $x^2$ and $\frac{1}{x^2}$ is

The mean of first five prime numbers is

Mean of all factors of $12$ is

Median of first $12$ prime numbers is

Class-mark of the class $100-120$ is

Range of $25, 18, 20, 22, 16, 6, 17, 12, 30, 32, 10, 19, 8, 11, 20$ is

In class intervals $10-20$, $20-30$, the number $20$ is included in

If mean of the following is $15$, then the value of $a$ is