Problem N5617 probability theory confidence interval

Problem N5617 probability theory confidence interval

5617. In control tests of n = 15 lamps, 3000 hours were determined. Assuming that the lamp life is normally distributed from 19 hours, determine the width of the confidence interval for the general average with a reliability of 0.96.

Additional information:

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

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