Question

For a construction project the mean and standard deviation of the completion time are 200 days and 6.1 days respectively. Assume normal distribution and use the value of standard normal deviate z = 1.64 for the 95% confidence level. The maximum time required (in days) for the completion of the project would be ________

Answer 1

\(\begin{array}{l} {\rm{Z}} = \frac{{{{\rm{T}}_{\rm{s}}} - {{\rm{T}}_{\rm{E}}}}}{\sigma }\\ 1.64 = \frac{{{T_s} - 200}}{{6.1}} \end{array}\)

T_s = 210 days