“Gas Additive A” Additive: “A”

Values below Q1:
“-15, -4, -2”

Q1: “1”

Median: “3”

Q3: “4”

Values above Q3:
“5, 7, 8”

A consumer advocate conducted a test of a popular gasoline additive that was claimed to increase gasoline mileage in cars. For
a sample of 15 cars they used the additive and determined how many more miles the car could drive when the additive was added to the gas tank.

For example, a positive 10 would mean that the car drove 10 more miles with the additive whereas a-3 would mean that the car drove 3 fewer miles with the additive.

The table shows a few data values (of how many more miles a car could drive with the additve) along with some summary statistics.

Are there any striking deviations?

A.) -15

B.) -2

C.) 7

D.) 8