2. a Twenty switches were put on a rig test. The first 15 failures occurred at the following numbers of cycle operation: 420, 890, 1090, 1120, 1400, 1810, 1815, 2150, 2500, 2510, 3030, 3290, 3330, 3710 and 4250. Plot the data on Weibull paper and give estimates of (i) the shape parameter Beta; (ii) the mean life Mue; (iii) the B 10 life; (iv) the upper and lower 90% confidence limits on Beta; (v) the upper and lower 90% confidence limits on the probability of failure at 2500 operations. Finally, use the Kolmogorov-Smirnov test to assess the goodness-of-fit of your data.

b Alternatively, find the solution to the part (a) using softwere. If using Weibull++ run Distribution Wizard to compare your choice against other different distributions in the package. What is the best fit distribution for this data.