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Find the mean and standard deviation

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Reference no: EM131748205

Stop! Find the mean and standard deviation of the number of red lights the commuter in Exercise 18 should expect to hit on her way to work during a 5-day work week.

Exercise 18:

Red lights. A commuter must pass through five traffic lights on her way to work and will have to stop at each one that is red. She estimates the probability model for the number of red lights she hits, as shown below.

2007_Red lights.png

a) How many red lights should she expect to hit each day?

b) What's the standard deviation?

Reference no: EM131748205

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