Weekly CPU time used by an accounting firm has probability density function (measured in hours)
![318_02a7ca73-c25a-4ad6-aa3b-23395c580859.png](https://secure.tutorsglobe.com/CMSImages/318_02a7ca73-c25a-4ad6-aa3b-23395c580859.png)
a Find the expected value and variance of weekly CPU time.
b The CPU time costs the firm $200 per hour. Find the expected value and variance of the weekly cost for CPU time.
c Will the weekly cost exceed $600 very often? Why or why not?