Question

4. Media aritmetică a tuturor numerelor naturale nenule mai mici deca 2022 este: ​

Answer 1

$\frac{1 + 2 + 3 + ... + 2021}{2021} = \frac{ \frac{2021 \times (2021 + 1)}{2} }{2021} \\ \\ = \frac{ \frac{2021 \times 2022}{2} }{2021} = \frac{2021 \times 1011}{2021} = 1011$