Six sets of bearings tested until wear-out failed at 1.3, 2.7, 4.0, 5.2, 6.6 and 9.8 (X 10^8) cycles. Using the median ranks tables,
A) fit the data to the two-parameter Weibull distribution R(t) = e^ -(t/beta)^alpha
B) plot F(t) for 0 <= t <= 10e8 cycles and compare it to the data, and,
C) find the MTTF (or mean cycle for failure) for the bearings