167 NHTSA new car crash testing. The National Highway Traffic Safety Administration (NHTSA) performs crash tests of new car models. The NHTSA has developed a

“star” scoring system, with results ranging from one star

(*) to five stars (*****). The more stars in the rating, the better the level of crash protection in a head-on collision.

A summary of the driver-side star ratings for 98 cars

(saved in the CRASH file) is reproduced in the accompanying MINITAB printout. Assume that one of the 98 cars is selected at random. State whether each of the following is true or false:

a. The probability that the car has a rating of two stars is 4.

b. The probability that the car has a rating of four or five stars is .7857.

c. The probability that the car has a rating of one star is 0.

d. The car has a better chance of having a two-star rating than of having a five-star rating.

Transcribed Image Text:

Tally for Discrete Variables: DRIVSTAR DRIVSTAR Count Percent 2 4 4.08 3 17 17.35 45 4 59 60.20 18 18.37 N= 98