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

3) What is the probability that a random tire will last between 40,000 and 60,000 miles?

A. 0.699

B. 0.327

C. 0.551

D. 0.148