Question

The sale of diesel (in litres) on different days of a week is recorded and represented as follows:


What will be the average sale of diesel in a week?

• A. $69\text{litres}$
• B. $78\text{litres}$
• C. $90\text{litres}$
• D. $75\text{litres}$

Answer 1

The correct option is B $78\text{litres}$

Observe the given data, the mean or average sale of diesel will be calculated as,

$\begin{array}{cc}\text{Mean}& =\frac{\text{Sum of all data points}}{\text{Total number of observations}}\\ & =\frac{75+69+83+70+74+85+90}{7}\\ & =\frac{546}{7}\\ & =78\end{array}$

Thus, the average sale of diesel in a week is $78\text{litres}$.

So, option (b) is correct.