10. Suppose 30 items are put on test that is scheduled to stop when the 8th failure occurs. If the failure times are, in hours, .35, .73, .99, 1.40, 1.45, 1.83, 2.20, 2.72, test, at the 5 percent level of significance, the hypothesis that the mean life is equal to 10 hours. Assume that the underlying distribution is exponential.