The mileage (km per litre) of 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 . Do you agree with this claim?
S.N | Mileage (km L-1) | Class –Marks (xi) | Number of cars (fi) |
Find the mean mileage of the cars.
Given,
The mileage of cars put through testing by a manufacturer.
S.N | Mileage (km L-1) | Class –Marks (xi) | Number of cars (fi) | fixi |
Step 1: Apply direct method
From the table,
Thus, the mean mileage is .
Step 2: Find mean mileage less than the manufacturers claim.
Given, the manufacturer claimed that the mileage of the model was .
Difference in mileage
Hence, the mean mileage is less than the manufacturers claim.