If the men and standards deviation of 100 observations are 50 and 4 respectively. Find the sum of all the observations and the sum of their squares.

Explanation

Given,

Number of items, `n=100`

Mean `bar x=50 `


But
we know,
Standard deviation,`=sqrt(((sumx_i)/n)^2​−(barx_i)^2)`

Given, `sumx=50,n=100`

`=>4=sqrt((sumx^2)/(100)​−(50)^2)`

...