Let X = the time it takes a read/write head to locate a desired record on a computer disk memory device once the head has been positioned over the correct track. If the disks rotate once every 25 millisec, a reasonable assumption is that X is uniformly distributed on the interval [0, 25].
![](https://test.transtutors.com/qimg/6e6503a9-0459-4ab3-b6ac-7218d307a893.png)