Transportation officials tell us that 90% of drivers wear seat belts while driving. Find the probability that more than 551 drivers in a sample of 600 drivers wear seat belts.
A) 0.1
B) 0.9
C) 0.9406
D) 0.0594

Question

Quizplus · Accepted Answer

The problem can be solved using the normal approximation to the binomial distribution. The mean (μ) is 540 and the standard deviation (σ) is 7.35. We find the z-score for 551.5 (continuity correction) and use the standard normal distribution to find the probability, which is approximately 0.0594.

Transportation Officials Tell Us That 90% of Drivers Wear Seat