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 mean= 0.5 and variance (w^2)= 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?