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# An internet site has determined that the length of time that users spend on its site is normally distributed with a mean of 5.9 minutes and a...

An internet site has determined that the length of time that users spend on its site is normally distributed with a mean of 5.9 minutes and a standard deviation of 1.8 minutes.

Find:

(a) the probability that a user will stay on the site for more than 7 minutes.

(b) the probability that a user will stay on the site between 2 and 5 minutes.

(c) the 91st percentile for the length of time spent on the site (a time such that 91% of users stay less than that time).

(d ) the probability that a random sample of 30 users has a mean of more than 5.25  minutes on the site.

a) ﻿ P ( x &gt; 7 ) = 0 . 2 7 0 9 ﻿ b) ﻿ P ( 2 &lt; x &lt; 5 ) =... View the full answer

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