The time between unplanned shutdowns of a power plant has an exponential distribution with a mean of

Question:

The time between unplanned shutdowns of a power plant has an exponential with a mean of 20 days. Find the probability that the time between two unplanned shutdowns is
a. Less than 14 days.
b. More than 21 days.
c. Less than 7 days. Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...