NHTSA new car crash testing. Refer to the National $ Highway Traffic Safety Administration...

NHTSA new car crash testing. Refer to the National $ Highway Traffic Safety Administration (NHTSA) crash tests of new car models, Recall that 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 MINITAB printout on p. 155. 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.

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

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

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

Crash tests on new cars. Each year, the National Highway Traffic Safety Administration (NHTSA) crash tests new car models to determine how well they protect the driver and front-seat passenger in a head-on collision. The NHTSA has developed a “star” scoring system for the frontal crash test, 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. The NHTSA crash test results for 98 cars in a recent model year are stored in the data file named CRASH. The driver-side star ratings for the 98 cars are summarized in the MINITAB printout below. Use the information in the printout to form a pie chart. Interpret the graph.