BA 240
W. Li
02/16/06
1
Practice Exam 2
Problem 1
:
Suppose that the number of sick days an employee at XYZ Company takes
per year is normally distributed with mean 9 days and standard deviation of
2.5 days.
a)
What proportion of the employees are out fewer than 7.5 days?
b)
What proportion of the employees are out more than 8 days?
c)
What proportion of the employees are out between 8 days and 13 days?
d)
The CEO of the company decides to award the employees with the fewest
absences by giving a financial award to the employees with the lowest 10% of
absences. What is the largest number of absences that an employee could have
and still get a monetary award?
e)
On the other hand, the employees with the highest 10% of absences will be
required to visit the company doctor for a physical. What is the lowest number of
absences that an employee must have and still be required to see the doctor?
f)
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 Fall '08
 Li
 Statistics, Normal Distribution, Standard Deviation, Statistical hypothesis testing, XYZ Company, bad debt ratio

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