Over the past decade the mean number of members of the Information Systems Security Association who have experienced a denial-of-service attack each year is 510 with a standard deviation of 14.28 attacks. Suppose nothing in this environment changes.
Compute the probability the mean number of attacks over the next 10 years is between 500 and 600.
What is the possibility they will experience an average of less than 500 attacks over the next 10 years?