Question

the mean of the square of the first n natural no.​

Answer 1

Answer:

we know

mean is sum of observation / total number of observation..

here sum of observation is sum of n natural number.. i.e.

$\frac{n(n + 1)}{2}$

and total number of observation is n

so the mean is

$\frac{ \frac{n(n + 1)}{2} }{n} = \frac{n(n + 1)}{2n}$

hope this will help you..