Problem regarding the lefties-seatbelts

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1. Lefties. A lecture hall has 200 seats with folding arm tablets, 30 of which are designed for left-handers. The typical size of classes that meet there is 188, and we can assume that about 13% of students are left-handed. Use a Normal approximation to find the probability that a right- handed student in one of these classes is forced to use a lefty arm tablet.

2. Seatbelts. Police estimate that 80% of drivers wear their seatbelts. They set up a safety roadblock, stopping cars to check for seatbelt use. If they stop 120 cars, what's the probability they find at least 20 drivers not wearing their seatbelt? Use a Normal approximation.

Reference no: EM131008722

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