Let "X=" the time taken to clean up a particular fast food outlet after it closes in minutes:"X\\sim N(\\mu, \\sigma^2)"
Then
Given that "\\mu=30\\ minutes, \\sigma=5 \\ minutes"
a.
"\\approx0.022750"
The probability that the cleanup crew will complete the job in less than 20 minutes is "0.0228"
b.
"=1-P(Z\\leq1.6)\\approx1-0.945201\\approx0.0548"
The probability that the cleanup crew will complete the job in more than 38 minutes is "0.0548"
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