Answer:
0.16
Step-by-step explanation:
Given that the length of time Y necessary to complete a key operation in the construction of houses has an exponential distribution with mean 18 hours.
The formula for cost of completing this operation is
C has mean 3124
Var(C) = 28,460,160
Std dev (C) =
X = 4000 hours
Difference =
Mean diff/std dev =
i.e.nearly 0.16 standard deviations above the mean is 4,000 hours