題組內容

5. Assume the miles-per-gallon of the model Q cars is distributed with a mean of 22 miles-per-gallon and a standard deviation of 12 miles- per-gallbn. 36 model Q cars are sampled.

(B). What is the probability that mean milcs-per-gaHon of the 36 cars will get exactly 22 mean miles-per-gallon?