Probability of total monthly sick-leave time


Question:

The total monthly sick-leave time X of employees of a small company has a normal distribution with mean 100hours and standard deviation 20hours.

(1) What is the probability that the total monthly sick-leave time is between 50 and 80hours?

(2) How much time has to be budgeted for sick leave to make sure that the budgeted amount is exceeded with a probability not greater than 0.1?

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Other Subject: Probability of total monthly sick-leave time
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