The life expectancy of a particular brand of tire is normally distributed...

Question

The life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and a standard deviation of 5,000 miles.

Refer to Exhibit 6-6. What is the probability that a randomly selected tire will have a life of exactly 47,500 miles?

a. .4332

b. 0

c. .0668

d. .9332

Answer 1

Since continuous probability functions are defined for an infinite number of points over a continuous interval, the probability at a single point is always zero. So the answer is b.