A manufacturing company makes windows for use in commercial buildings. The standards for glass thickness call for the glass to average 0.375 inches with a standard deviation of 0.049 inches. A random sample of 49 windows was chosen. If the windows meet the standards,
a. How likely is it to find a sample mean that exceeds 0.392?
b. Find the value of the sample mean that would exceed 2.5% of all possible sample means.