A commuter must pass through five traffic lights on her way to work and will have to stop at each one that is red. After keeping a record for several months, she developed the following probability model for the number of red lights she hits:

a) How many red lights should she expect to hit each day?
b) What€™s the standard deviation?

Transcribed Image Text:

X = # of Red p(X =x) 0.05 0.25 0.35 0.15 0.15 0.05