Related to Z score
A construction company builds triplexes and quadruplexes apartments for investors. It follows a normal distribution.
The mean time build triplex is 500days and standard dev is 100days. Recently the president of this company signed a contract to complete triplex in 625 days. Failure will lead to 10K$ fine. What is the probability that the company will not have to pay the penalty fees? Also approx how many penalty fee will it have to pay, if total triplexes to be build is 50?