Question: The length of time, in seconds, that a computer user takes to read his or her e-mail is distributed as a lognormal random variable with

The length of time, in seconds, that a computer user takes to read his or her e-mail is distributed as a lognormal random variable with μ = 1.8 and σ = 4.0.

1. What is the probability that a user reads e-mail for more than 20 seconds? More than a minute?

2. What is the probability that a user reads e-mail for a length of time that is equal to the mean of the underlying lognormal distribution?

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