Question: A sample of 50 transistors is simultaneously put on a test that is to be ended when the 15th failure occurs. If the total time

A sample of 50 transistors is simultaneously put on a test that is to be ended when the 15th failure occurs. If the total time on test of all transistors is equal to 525 hours, determine a 95 percent confidence interval for the mean lifetime of a transistor.

Assume that the underlying distribution is exponential.

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