Suppose that the time it takes for a novice secretary to type a document is exponential with mean 1 hour. If at the beginning of a certain eight-hour working day the secretary receives 12 documents to type, what is the probability that she will finish them all by the end of the day?

Lecture 10/04/2017 → Section 3.4 ← Factorial Factorials count the number of ways of order “n” objects without repetition, and is defined as, n! = n • (n - 1) • (n - 2) • … • 3 • 2 • 1 o 0! = 1 o Example: How many ways can someone rearrange 4 books on a shelf 4! = 4 • 3 • 2 • 1 = 24 ways o n! In terms...