In the case of the following problems in all cases of exponential distribution probability calculation is the 1-e utilized.
A certain make of tire has a mean life expectancy of 50,000 miles (exponentially distributed).
1) What is the probability that a random tire will last less than 30,000 miles?
A. 0.451
B. 0.632
C. 0.600
D. 0.247
2) What is the probability that a random tire will last more than 70,000 miles?
A. 0.714
B. 0.247
C. 0.124
D. 0.753