Your office network has been measured to stay working an average of 2,200 hours with a standard deviation of 285 hours.
What is the probability that the network will stay up for 2,800 hours before it fails? (Keep two decimal points in your percentage answer.)
What i got is that 2800-2200/285 = 2.105
Looking at the Z table we get 0.9821. WE then do 1 - 09.9821 to get 0.0179