Question

The arithmetic mean of 1² 2² 3²____n² is ​

Answer 1

Answer:

All the steps are provided below

Step-by-step explanation:

Arithmetic mean =

$\frac{ \: {1}^{2} + {2}^{2} + {3}^{2} + ..... + {n}^{2} }{n}$

${1}^{2} + {2}^{2} + {3}^{2} + ..... + {n}^{2} = \frac{n(n + 1)(2n + 1)}{2}$

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