1. The random variable X = the stopping distance of a randomly selected pickup truck on dry pavement from a speed of 62 mph can be modeled by a normal distribution with u = 155 ft and o
= 3 ft. Use the 68-95-99.7 rule to approximate:
(a) PIX > 158) - DO
a=
(b) The probability that a randomly selected emergency stop is between 149 ft and 152 ft. (Use
probability notation in your final answer.)
3
2. The probability distributions of a continuous random variables are shown below. Identify the
location of the mean, median, and mode by letter.