Question:
The mileage (km per litre) of 50 cars of the same model was tested by a manufacturer and details are tabulated as given below
Find the mean mileage.
The manufacturer claimed that the mileage of the model was 16 kmL -1.
Do you agree with this claim?
Solution:
Here, $\Sigma f_{i}=50$
and $\Sigma f_{i} x_{i}=724$
$\therefore$ Mean $\bar{x}=\frac{\sum f_{i} x_{i}}{\sum f_{j}}$
$=\frac{724}{50}=14.48$
Hence, mean mileage is $14.48 \mathrm{kmL}^{-1}$.
No, the manufacturer is claiming mileage $1.52 \mathrm{kmh}^{-1}$ more than average mileage.
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