Stop! Suppose the commuter in Exercise 30 has a 5-day workweek. a) Find the mean and standard deviation of the number of red lights the commuter should expect to hit in her week. b) What assumption...

a) Find the mean and standard deviation of the number of red lights the commuter should expect to hit in her week.

b) What assumption did you make about the days?

c) Use the mean and standard deviation to describe a typical week.

d) Upon arriving home on Friday, the commuter remarks, “Wow! My commute was quick all week.” How many red lights would it take to deserve a feeling of good luck?