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Find sample size, mean and standard deviation for the binomial distribution.

Law Enforcement: Speed Traps Do you warn oncoming traffic of a police speed trap? About 40% of all drivers will flash their lights to warn oncoming traffic of a speed trap ahead. Suppose seven cars have just driven past a police speed trap.

a) What is the probability at least one of the drivers will warm oncoming traffic?

b) What is the expected number of these seven drivers who will warm 9 oncoming traffic of a police speed trap ahead? What is the standard deviation?

c) How many cars n would need to go by the speed trap to be 99.8% sure that at least one driver will warm oncoming traffic of the speed trap?

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