Statistics · Mathematics · KCET

The mean of 100 observations is 50 and their standard deviation is 5. Then, the sum of squares of all observations is

If the standard deviation of the numbers $$-1, 0,1, k$$ is $$\sqrt{5}$$ where $$k>0$$, then $$k$$ is equal to

The standard deviation of the numbers $$31,32,33 \ldots 46,47$$ is

The standard deviation of the data 6, 7, 8, 9, 10 is

Mean and standard deviation of 100 items are 50 and 4 , respectively. The sum of all squares of the items is