Specify the number of events (N) and the probability of success on any one event (p). The mean and standard deviation will be computed and the probability distribution will be graphed. To find a cumulative probability, specify whether you want to find the probability of the number of successes to be less than or equal to a value, greater than or equal to a value, or between two values. When you ask for the probability between two values, both values are included. Therefore, the probability between 3 and 5 is the probability of 3, 4, or 5. To find the probability of 3 successes, find the probability between 3 and 3. The specified range is shown in red and the probability is displayed at the bottom.