5551. x̅=18.61, n=16, σ=10. The standard deviation σ=10 of a normally distributed random variable X, the sample mean x̅=18.61, and the sample size n=16 are given. Find the confidence interval for estimating the unknown mathematical expectation a with a given reliability γ=0.95.

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