The average annual return over the period 1926-2009 for the s& p 500 is 12.8%, and the standard
deviation of returns is 21.4%. based on these numbers, what is a 67% confidence interval for
2010 returns?
a) -1.3%, 20.5%
b) -8.6%, 34.2%
c) -25.8%, 54.7%
d) -25.8%, 47.9%

Harry and jay are both flying on the same plane with an airline that randomly assigns seats to passengers. of the 182 total seats on the plane, 62 are window seats, 58 are middle seats, and the rest are aisle seats. what is the approximate probability that both harry and jay will be assigned aisle seats on the same plane? a. 11.48% b. 3.3% c. 2.08% d. 26.26%