In a standard normal distribution, the O a mean is 0 and the standard deviation is 1. Ob) mean and the standard deviation are both 1, O d mean and the standard deviation can have any value. O d) mean is I and the standard deviation is 0.The travel time for a college student traveling between her home and her college is uniformly distributed between 40 and 20 minutes. The probability that her trip will take exactly 50 minutes is a 0.02. Ob) zero O d 0.20 O d) 0.06