Using the Normal Distribution · Exercise 30
Terri Vogel, an amateur motorcycle racer, averages 129.71 seconds per 2.5-mile lap, in a seven-lap race, with a standard deviation of 2.28 seconds. The distribution of her race times is normally distributed. We are interested in one of her randomly selected laps.
(a) In words, define the random variable X.
(b) X ~ _____ (_____, _____)
(c) Find the percent of her laps that are completed in less than 130 seconds.
(d) The fastest 3 percent of her laps are under _____.
(e) The middle 80 percent of her laps are from _______ seconds to _______ seconds.
Its source prints no answer for this problem, so there's nothing to check against.
OpenStax, Statistics · §6.2 Using the Normal Distribution · Exercise 30
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