0.22, 0.50, 0.88, 1.00, 1.32, 1.33, 1.54, 1.76, 2.50, 3.00, 3.65, 4.20, 6.40 in hours.

(a) Give the nonparametric maximum likelihood estimate of the reliability

function.

(b) Give the point estimate and approximate 95% confidence interval for R(1.6).