Question

The attendance of a class of $45$ boys for $10$ days is given as $40,42,30,35,45,44,41,38,44$ and $41$, then the mean attendance of a class is:

• A. $39$
• B. $40$
• C. $41$
• D. $43$

Answer 1

The correct option is B $40$

Given, attendance of $45$ boys for $10$ days is $40,42,30,35,45,44,41,38,44,41$.

We know, Mean is given by,

$\text{Mean}=\frac{\text{Sum of the elements}}{\text{Total number of elements}}$.

Here, number of observations $=10$.

Therefore, mean $=\frac{40+42+30+35+45+44+41+38+44+41}{10}=\frac{400}{10}=40$.

Therefore, option $B$ is correct.