4. Problem 55: a. 15.39% (8 - 10.3) I 2.25 = -1.02, 0.5000 - 0.3461 = 0.1539. b. 12.31% : z = (12 - 10.3) I 2.25 = 0.?6. Area = 0.2264. 2 = (14 - 10.3) I 2.25 = 1.64. Area = 0.4495. The area between 12 and 14 is 0.1731 (0.4495 - 0.2264). c. On 99.73% of the days, returns were between 3.55 and 1?.05( 10.3 + 3(2.25). The Chance of less than 3.55 returns is small