The total monthly sick leave time of employees of a small company has a normal distribution with

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

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

(2) How much time has to be budgeted for sick leave to make sure that the budgeted total amount for sick leave is only exceeded with a probability of less than 0.1 ?

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