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What is the approximate value of the standard deviation

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Suppose that the distribution of scores on an exam is closely described by a normal curve with mean 100. The 16th percentile of this distribution is 80.

a. What is the 84th percentile?

b. What is the approximate value of the standard deviation of exam scores?

c. What z score is associated with an exam score of 90?

d. What percentile corresponds to an exam score of 140?

e. Do you think there were many scores below 40? Explain.

18   18   25   19  23

20

69

18   21   18   20  18

18   20   18   19  28

17

18

18

Reference no: EM131008541

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