“Boot time” (the time between the appearance of the Bios screen to the first file that is loaded in Windows) on Eric Mouser’s personal computer follows an exponential distribution with a mean of 27 seconds. What is the probability his “boot” will require:
a. Less than 15 seconds?
b. More than 60 seconds?
c. Between 30 and 45 seconds?
d. What is the point below which only 10% of the boots occur?