Example 1: Normal Distribution
1. When to Use
This method estimates m and s, the mean and standard deviation when failure times
are normally distributed. This method yields a less accurate estimate than
statistical analysis but requires very minimal calculations.
2. Conditions for
Use
a. 

Failure times must be collected, but may be censored;
censored data is discussed in the next section.

b. 

Normal probability paper is
required. 