Textbook ExpertVerified Tutor
30 Oct 2021
Given information
Given, 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.
Then we have to find the percent of her laps that are completed in less than 130 seconds.
Step-by-step explanation
Step 1.
According to the given information, a random variable can be defined as, race times for randomly selected laps. And the distribution of her race times is normally distributed. So, follows Normal Distribution with a mean of 129.11 and a standard deviation of 2.28.
To find the percent of her laps that are completed in less than 130 seconds,
,from the standard normal table
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