Reading 9: Common Probability Distributions - LOS g ～ Q1-3 describes, standard, average, returns

mayanfang1

Q1. A stock portfolio has had a historical average annual return of 12% and a standard deviation of 20%. The returns are normally distributed. The range –27.2 to 51.2% describes a:

A)   68% confidence interval.

B)   99% confidence interval.

C)   95% confidence interval.

Q2. A stock portfolio's returns are normally distributed. It has had a mean annual return of 25% with a standard deviation of 40%. The probability of a return between -41% and 91% is closest to:

A)   65%.

B)   95%.

C)   90%.

Q3. For a normal distribution, what approximate percentage of the observations fall within ±3 standard deviation of the mean?

A)   66%.

B)   99%.

C)   95%.

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