The average (mean) amount of time that a manager at the Cimaron Valley Department of Human...
The average (mean) amount of time that a manager at the Cimaron Valley Department of Human Services spends in the annual performance review with an employee is 31.5 minutes, with a standard deviation of 5.5 minutes (normal distribution)
(a) What percentage of the annual performance reviews in the department take between 26 and 37 minutes?
(b) Between 20.5 and 42.5 minutes?
(c) Between 15 and 48 minutes?
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Here we will standardize the variable to standard normal variable.
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