Suppose you buy a new car whose advertised mileage is 26 miles per gallon(mpg). After driving your car for severalmonths, you find that its mileage is 21.6 mpg. You telephone the manufacturer and learn that the standard deviation of gas mileages for all cars of the model you bought is 1.22 mpg.

a. Find thez-score for the gas mileage of yourcar, assuming the advertised claim is correct.

b. Does it appear that your car is getting unusually low gasmileage?

a. z=

b. Does it appear that your car is getting unusually low gasmileage?

A. No

B. Yes