Problem N5522 probability theory confidence interval
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5522. x̅=55, n=81, σ=8, Find the confidence interval for estimating the expectation of a normal distribution with a reliability of 0.95, knowing the sample mean x̅=55, sample size n=81, and standard deviation σ=8.
Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)