The stocks of company X are sold at $5 per share. Stocks of company Y are sold at $25 per share. According to a broker, 1 share of each company can either gain $1, with probability 0.5, or lose $1, with probability of 0.5, independently of the other company. Which of the following portfolios has the lowest risk:

a.50 stocks of A
b.25 stocks of A + 5 stocks of B
c.20 stocks of A + 6 stocks of B

Three friends went on a road trip from phoenix, az, to san diego, ca. mark drove 50 percent of the distance. jason drove 1/8 of the distance. andy drove the remainder of the distance. 1. andy thinks he drove 1/4 of the distance from phoenix, az, to san diego, ca. is andy correct? 2. the distance from phoenix, az, to san diego, ca, is 360 miles. how many miles did each person drive? 3. solve the problem. what is the answer in total?