3.2.99

(a)

(b) About 68% of the stock returns lie between −14.87 and 23.91. About 95% of the stock returns lie between –34.26 and 43.3. About 99.7% of the stock returns lie between –53.65 and 62.69. (c) 76% of the stock returns lie between –14.87 and 23.91. 94% of the stock returns lie between –34.26 and 43.3. 98% of the stock returns lie between –53.65 and 62.69. (d) The actual percentages that lie within each interval are close to the approximate percentages given by the Empirical Rule.