Nonparametric Maximum Likelihood Estimate

#1
Thirteen electrical components were placed on a life test, yielding failure times 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.


How would this look written numerically?
and Please plot this. Thanks