Chapter 6: Q.11 (page 385)
What is the z-score of x=, if it is two standard deviations to the right of the mean?
Short Answer
The value of the z score will be
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Chapter 6: Q.11 (page 385)
What is the z-score of x=, if it is two standard deviations to the right of the mean?
The value of the z score will be
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Find the 80th percentile.
Suppose that Ricardo and Anita attend different colleges. Ricardo's GPA is the same as the average GPA at his school. Anita's GPA is standard deviations above her school average. In complete sentences, explain why each of the following statements may be false.
a. Ricardo's actual GPA is lower than Anita's actual GPA.
b. Ricardo is not passing because his -score is zero.
c. Anita is in the percentile of students at her college.
Terri Vogel, an amateur motorcycle racer, averages seconds per mile lap (in a seven-lap race) with a standard deviation of 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 .
b. ,
c. Find the percent of her laps that are completed in less than seconds.
d. The fastest of her laps are under
e. The middle of her laps are from seconds to seconds.
A normal distribution has a mean of 61 and a standard deviation of 15. What is the median?
Find the probability that is between three and nine.
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