The length of time (in seconds) that a user views a page on a Web site before moving to another page is a lognormal random variable with parameters ? = 2.5 and w2 = 1.
a) What is the probability that a page is viewed for more than 10 seconds?
b) What is the length of time that 50% of users view the page?
c) What is the mean and standard deviation of the time until a user moves from the page?