I need help solving this problem using probability.

1. Mr. Smart needs to make a decision on investing on one stock from two potential stocks in the market. To make this decision, Mr. Smart collects the return rates of the two stocks in the past 7 years (refer to Table 1 for the data). Stock 1 Stock 2 120% 80% 90% 120% 110% 135% 130% 150% 100% 160% 140% 105% 150% 90% If Mr. Smart has a conservative strategy, i.e., he is sensitive to the "bad" case in which the return rate