A researcher conducts a mileage economy test involving 80 cars. The frequency distribution describing average miles per

Question:

A researcher conducts a mileage economy test involving 80 cars. The frequency distribution describing average miles per gallon (mpg) appears in the accompanying frequency distribution.

Average MPG ....Frequency

15 up to 20 ......15

20 up to 25 .......30

25 up to 30 .....15

30 up to 35 ......10

35 up to 40 ...... 7

40 up to 45 ...... 3

a. Calculate the mean mpg.

b. Calculate the variance and the standard deviation.

Distribution
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