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Chapter 6: Q 17 (page 385)
Suppose X ~ N(9, 5). What value of x has a z-score of –0.5?
The value of is
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The patient recovery time from a particular surgical procedure is normally distributed with a mean of days and a standard deviation of days.
The percentile for recovery times is
a. 8.89
b. 7.07
c. 7.99
d. 4.32
The life of Sunshine CD players is normally distributed with a mean of years and a standard deviation of years. A CD player is guaranteed for three years. We are interested in the length of time a CD player lasts. Find the probability that a CD player will break down during the guarantee period.
a. Sketch the situation. Label and scale the axes. Shade the region corresponding to the probability.
b. (Use zero for the minimum value of x.)
Two thousand students took an exam. The scores on the exam have an approximate normal distribution with a mean points and standard deviation points.
a. Calculate the first- and third-quartile scores for this exam.
b. The middle of the exam scores are between what two values?
Use the following information to answer the next four exercises:
Find the probability that
About what percent of values lie between the mean and one standard deviation?
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