(p. 136). Recall that the NHTSA developed a driver-side “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. Suppose that a car is selected from the data and its driver-side star rating is determined. Let x equal the number of stars in the rating. Is x a discrete or continuous random variable?