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The length of time (in seconds) that a user views on a Web site before moving to another page is a lognormal random variable with

The length of time (in seconds) that a user views on a Web site before moving to another page is a lognormal random variable with parameters = 0.7 and 2 = 1.

(a) What is the probability that a page is viewed less than 15 seconds?

(b) By what length of time have 70% of the users moved to another page?

(c) What are the mean and variance of the time until a user moves from the page?

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