35. Seatbelts II. Police estimate that 80% of drivers
Chapter 17, Problem 35(choose chapter or problem)
35. Seatbelts II. Police estimate that 80% of drivers nowwear their seatbelts. They set up a safety roadblock,stopping cars to check for seatbelt use.a) How many cars do they expect to stop before findinga driver whose seatbelt is not buckled?b) Whats the probability that the first unbelted driver isin the 6th car stopped?c) Whats the probability that the first 10 drivers are allwearing their seatbelts?d) If they stop 30 cars during the first hour, find themean and standard deviation of the number of driversexpected to be wearing seatbelts.e) If they stop 120 cars during this safety check, whatsthe probability they find at least 20 drivers not wearingtheir seatbelts?
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