The article mentioned in Problem 7.30 reported that the stock market in Germany had a mean return of 6.9% in 2016. Assume that the returns for on the German stock market were distributed normally, with a mean of 6.9 and a standard deviation of 10. If you select an individual stock from this population, what is the probability that it would have a return
a. Less than 0 (i.e., a loss)?
b. Between -10 and -20?
c. Greater than -5?
If you selected a random sample of four from this population, what is the probability that the sample would have a mean return
d. Less than 0 (a loss)?
e. Between -10 and -20?
f. Greater than -5?
g. Compare your results in parts (d) through (f) to those in (a) through (c).
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