ame: ID: B 9. Jen's commute to work requires that she take the Blue subway line and then transfer to the Red line. The length of the trip on the Blue

line has a mean of 18 minutes and a standard deviation of 2 minutes. The length of the trip on the Red line has a mean of 12 minutes and a standard deviation of 1 minute. The waiting time between when she gets off the Blue line and her Red line train arrives has a mean of 10 minutes and a standard deviation of 5 minutes. Assume these times are independent random variables. The mean and standard deviation of her entire commute will be approximately a. Mean = 40 minutes; Standard deviation = 8 minutes. b. C. Mean = 40 minutes; Standard deviation = 5.48 minutes. Mean = 40 minutes; Standard deviation = 2.83 minutes. d. Mean = 30 minutes; Standard deviation = 5.48 minutes. Mean = 30 minutes; Standard deviation = 8 minutes. e.