Chapter 6: Q.7 (page 385)
Short Answer
The value of
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Chapter 6: Q.7 (page 385)
The value of
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Suppose X ~ N(–1, 2). What is the z-score of x = 2.
Use the information in Example 6.10 to answer the following questions.
In , students took the SAT exam. The distribution of scores in the verbal section of the SAT had a mean and a standard deviation . Let X = a SAT exam verbal section score in . Then . Find the z-scores for and. Interpret each z-score. What can you say about and as they compare to their respective means and standard deviations ?
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?
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