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 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