The cumulative failure plot depicts the probability that the item will fail after a particular time. Therefore, the plot shows the failure probability of the product over time. The Y-axis displays the probability of failure and the X-axis displays the reliability measurement (time, number of copies, miles driven).
For a nonparametric analysis, the cumulative failure plot is a step function with steps at the endpoints of each interval. In this example, the function is calculated using the actuarial estimation method.
For the engine windings running at 80° C, the probability that a winding will fail at or before 60 hours is 0.58.