5549. x̅=26.02, n=64, σ=4. The standard deviation σ=4 of a normally distributed random variable X, the sample mean x̅v=26.02, and the sample size n=64 are given. Find the confidence interval for estimating the unknown mathematical expectation a with a given confidence probability γ=0.95.

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