statistics
posted by UG .
The amount of corn chips dispensed into a 16ounce bag by the dispensing machine has been identified at
possessing a normal distribution with a mean of 16.5 ounces and a standard deviation of 0.1 ounce. Suppose 400
bags of chips were randomly selected from this dispensing machine. Find the probability that the sample mean
weight of these 400 bags exceeded 16.6 ounces

Z = (mean1  mean2)/SEm
SEm = SD/√n
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score. 
.5062

0.3085

Actually, I believe it's approximately zero.
Source: I have a MS in Mathematics 
Pardon me... approximately zero if the standard deviation is 0.2 ozs.