Question: A sample of 50 parts are inspected for a specific dimension with a resulting average of 2.22 and s = 0.67. What are the expected limits (lower and upper) of variation consuming 68% of the curve--assuming a normally-distributed process?
A. 1.55 and 2.89
B. 2.000 and 2.440
C. 0.570 and 0.829
D. Not enough information