Assume that the number of new visitors to a website in one hour is distributed as a Poisson random variable. The mean number of new visitors to the website is 2.6 per hour. Complete parts (a) through (d) below. . . . a. What is the probability that in any given hour zero new visitors will arrive at the website? The probability that zero new visitors will arrive is (Round to four decimal places as needed.) b. What is the probability that in any given hour exactly one new visitor will arrive at the website? The probability that exactly one new visitor will arrive is (Round to four decimal places as needed.) c. What is the probability that in any given hour two or more new visitors will arrive at the website? The probability that two or more new visitors will arrive is (Round to four decimal places as needed.) d. What is the probability that in any given hour fewer than three new visitors will arrive at the website? The probability that fewer than three new visitors will arrive is (Round to four decimal places as needed.)