The Employees in Certain Division of Cybertronics Inc

Multiple Choice

The employees in certain division of Cybertronics Inc.need to complete a certification online.On average,it takes 20 hours to complete the coursework and successfully pass all tests,and the standard deviation is 6 hours.If you select a random sample of size 30,the probability that the employees in your sample have taken,on average,more than 20.5 hours is ______.

A) 0.47
B) 0.45
C) 0.41
D) 0.32
E) 0.01