Question: Jane must pass through five traffic lights on her way to work and will have

to stop at each one that is red. The probability that the number of red lights she hits when she goes to work is:

Number of red lights 0 1 2 3 4 5

Probability 0.05 0.25 ??? 0.10 0.15 0.05

1. Find "???".
2. How many red lights should she expect to hit each day?
3. What is the standard deviation?

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