11. Suppose during the month of January 2016, the mean closing price of Disney s

Question

11. Suppose during the month of January 2016, the mean closing price of Disney stock was $97.29 with a standard deviation $3.15. During the same period, the mean closing price of Ford stock was $12.06 with a standard deviation of $0.57. If on January 7th Disney stock closed at $93.90 and Ford stock closed at $11.58, which stock performed better on that day relative to the other days of January? Justify your answer. 12. Suppose the heights of American women are normally distributed with a mean of 64 inches and a standard deviation of 4 inches. What is the probability that a randomly selected American woman is between 64 and 69 inches tall?

Explanation / Answer

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12)

Mean = 64

SD = 4

z1 = 0

z2 - (69 - 64)/4 = 1.25

P ( 0 < z < 1.25) = 0.39435

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