Completion Time (From Start to Finish)of a Building Remodelling Project

Multiple Choice

Completion time (from start to finish) of a building remodelling project is normally distributed with a mean of 200 work-days and a standard deviation of 10 work-days.To be 99% sure that we will not be late in completing the project, we should request a completion time of ___ work-days.

A) 211
B) 207
C) 223
D) 200
E) 250