Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 139 millimeters, and a variance of 64 . if a random sample of 41 steel bolts is selected, what is the probability that the sample mean would be greater than 140.3 millimeters? round your answer to four decimal places.
1. 0.1502
2. 0.6915
3. 0.3083
4. 0.6917
