A stock had returns of 14 percent, 13 percent, -10 percent, and 7 percent for the past four years. Which one of the following best describes the probability that this stock will lose no more than 10 percent in any one year?

Greater than .5 but less than 1.0 percent.

Greater than 1 percent but less than 2.5 percent.

Greater than 2.5 percent but less than 16 percent.

Greater than 84 percent but less than 97.5 percent.

Greater than 95 percent.

After calculating the mean and standard deviation of returns, can you explain please how to calculate the probability of a return being above, or below a certain number, by understanding the probabilities of returns falling within 1, 2 or 3 standard deviations (68%, 95%, 99% probabilities).