In 1957, the Program Evaluation and Review Technique (PERT) was created to support the U.S. Navy’s Polaris submarine project. One of the elements of PERT is the way that estimates are calculated. Create an estimate by defining the optimistic $O$, nominal $N$, and pessimistic $P$ time. With those three figures, calculate the mean and standard deviation as follows: - $\mu = \frac{O+4N+P}{6}$ - $\sigma = \frac{P-O}{6}$ Review tasks where the mean is unusually far from the nominal estimate. Source: The Clean Coder, Robert C. Martin