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A certain stock market had a mean return of 3.4​% in a recent year. Assume that the returns for stocks on the market were distributed​ normally, with a mean of 3.4 and a standard deviation of 10. Complete parts​ (a) through​ (g) below. a. If you select an individual stock from this​ population, what is the probability that it would have a percentage return less than 0 ​(that is, a​ loss)? . ​(Round to four decimal places as​ needed.) b. If you select an individual stock from this​ population, what is the probability that it would have a percentage return between negative 12 and negative 20​? ​(Round to four decimal places as​ needed.) c. If you select an individual stock from this​ population, what is the probability that it would have a percentage return greater than negative 3​? ​(Round to four decimal places as​ needed.) d. If you select a random sample of four stocks from this​ population, what is the probability that the sample would have a mean percentage return less than 0 ​(a loss)? e. If you select a random sample of four stocks from this population, what is the probability that the sample would have a mean percentage return between −12 and −20? f. If you select a random sample of four stocks from this population, what is the probability that the sample would have a mean percentage return greater than −3?

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