1. A student has computed that it takes an average of 17 minutes with a standard deviation of 3 minutes to drive from home, park the car, and walk to an early morning class. Find the proportion of times whose time X satisfies each of the following conditions:

A) If you selected 10 days at random, what is the probability that half the days will take between 15 and
20 minutes?

B) What is the probability the second day selected will be the first day he is late to class, assuming he left
at 8:39am?

(I know how to solve for the probabilities on their own, however I’m not sure how to incorporate the added probability based on multiple days)