Question 1006317
Mean=72 hours
SD=8 hours, square root of variance
56 hours is 2 SDs below the mean.
0.0228 or 2.28% of the time, it will be fewer than 56 hours
97.72% of the time, it will be greater than or equal to 56 hours.
95% of the time is +/- 1.96 SDs or 15.68 hours
CI is (56.32,87.68) units are hours.