The mean number of crashes per month at an intersection is known to be 1. What is the probability that there will not be a crash in the next month? What is the probability there will be more than two...

The mean number of crashes per month at an intersection is known to be 1. What is the probability that there will not be a crash in the next month? What is the probability there will be more than two crashes?

For a normal distribution with mean equal to 55 and standard deviation equal to 5, find the 5, 25, 50, 75, and 95% points (percentiles).