Transportation officials tell us that 80% of drivers wear seat belts while driving. What is the probability of observing 633 or fewer drivers wearing seat belts in a sample of 850 drivers?
A) approximately 0
B) 0.8
C) 0.2
D) approximately 1

Question

Quizplus · Accepted Answer

The probability of observing 633 or fewer drivers wearing seat belts in a sample of 850 drivers is approximately 0. This is because the probability of observing 633 or fewer drivers wearing seat belts is the same as the probability of observing 634 or more drivers not wearing seat belts. The probability of observing 634 or more drivers not wearing seat belts is very small, since 80% of drivers wear seat belts.

Transportation Officials Tell Us That 80% of Drivers Wear Seat