NHTSA crash tests. Refer to the National Highway Traffic Safety Administration (NHTSA) cra...

NHTSA crash tests. Refer to the National Highway Traffic Safety Administration (NHTSA) crash tests of new car models, presented in Exercise. A summary of the driver–side star ratings for the 98 cars in the CRASH file is reproduced in the accompanying MINITAB printout. Assume that 1 of the 98 cars is selected at random, and let x equal the number of stars in the car’s driver–side star rating.

a. Use the information in the printout to find the probability distribution for x.

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b. Find P(x= 5).

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c. Find P(x≤ 2).

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d. Find μ = E(x) and interpret the result.

NHTSA crash tests. The National Highway Traffic Safety Administration (NHTSA) has developed a driver–side “star” scoring system for crash–testing new cars. Each crash–tested car is given a rating ranging from one star (*) to five stars (*****): the more stars in the rating, the better is the level of crash protection in a head–on collision. Suppose that a car is selected and its driverside star rating is determined. Let x equal the number of stars in the rating. Is x a discrete or continuous random variable?