Question

if sum of items is 40 and mean is 4 find out ‘‘N’’ (number) of items.​

Answer 1

We Know that;

$\boxed{Mean=\frac{\sum n_{i} }{\sum i}}$

Given;

Mean=4

$\sum n_{i}$=40

Let;

The number of items

i.e. $\sum i$ be n

According to the formula;

4=40/n

4n=40

n=40/4

n=10

Answer:

the number of items is 10