statisticQ3:Last year,the rates of return on the common stocks in a large portfolio had a mean of 20% and a standard deviation of 10%.The distribution of rates of return was skewed.Which of the following statements must be true?(a) Approximately 68%

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statisticQ3:Lastyear,theratesofreturnonthecommonstocksinalargeportfoliohadameanof20%andastandarddevi

statisticQ3:Last year,the rates of return on the common stocks in a large portfolio had a mean of 20% and a standard deviation of 10%.The distribution of rates of return was skewed.Which of the following statements must be true?(a) Approximately 68%
statistic
Q3:Last year,the rates of return on the common stocks in a large portfolio had a mean of 20% and a standard deviation of 10%.The distribution of rates of return was skewed.Which of the following statements must be true?
(a) Approximately 68% of the stocks had rates of return between 10% and 30%
(b) At least 75% of the stocks had rates of return 10% and 30%
(c) At least 85% of the stocks had rates of return between 0% and 40%
(d) At most 25% of the stocks had rates of return greater than 40%
(e) No stocks had a rate of return greater than 60%