Truck tire life is normally distributed with a mean of 60,000 miles and a standard deviation of 4,000 miles. What is the probability that a tire will last 72,000 miles or more?
A) 0.0013
B) 0.9987
C) 0.4987
D) 0.9544

Question

Quizplus · Accepted Answer

To find the probability that a tire will last 72,000 miles or more, we calculate the z-score: z = (72,000 - 60,000) / 4,000 = 3. Using the standard normal distribution table, the probability of a z-score being 3 or more is 0.0013.

Truck Tire Life Is Normally Distributed with a Mean of 60,000