The mileage (km per litre) of 50 cars of the same model was tested by a manufacture and details are tabulated as given below

Find the mean mileage. The manufacture claimed that the mileage of the model was 16 kmL. Do you agree with this claim?

Explanation

Here `sumf_(i)=50`
`sumf_(i)x_(i)=724`
`"Mean"bar(x)=(sumf_(i)x_(i))/(sumf_(i))`
`(724)/(50)=14.48`
Hence, mean mileage is `14.48kmL^(-)`
No, the manufacturer is claimed mileage `1.52kmh^(-)` more than average mileage.