5725. Based on a sample of n=9, a sample average of piston ring diameters was calculated. Under the assumption of a normal distribution, determine with reliability γ=0.92 the accuracy δ with which the sample mean estimates the mathematical expectation, knowing that the standard deviation of the piston ring diameters is σ=2.

Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)