A sample of 25 relays is chosen for life testing. The time to failure of a relay

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A sample of 25 relays is chosen for life testing. The time to failure of a relay is exponentially distributed. The test is terminated after 800 hours, with 5 failures being observed at times 610, 630, 680, 700, and 720 hours. Failed items are not replaced. Estimate the mean life and the failure rate of the relays. Find a 95% confidence interval for the mean life.
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