Engineering Economy
Engineering Economy
16th Edition
ISBN: 9780133582819
Author: Sullivan
Publisher: DGTL BNCOM
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Chapter 12, Problem 15P
To determine

Calculate the variance.

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Assume that the traffic to the web site of Smiley’s People, Inc., which sells customized T-shirts, follows a normal distribution, with a mean of 4.48 million visitors per day and a standard deviation of 800,000 visitors per day.   (a) What is the probability that the web site has fewer than 5 million visitors in a single day? If needed, round your answer to four decimal digits.     (b) What is the probability that the web site has 3 million or more visitors in a single day? If needed, round your answer to four decimal digits.     (c) What is the probability that the web site has between 3 million and 4 million visitors in a single day? If needed, round your answer to four decimal digits.     (d) Assume that 85% of the time, the Smiley’s People web servers can handle the daily web traffic volume without purchasing additional server capacity. What is the amount of web traffic that will require Smiley’s People to purchase additional server capacity? If needed, round your…
Suppose commute times in a large city are normally distributed and that 65.20% of commuters in this city take more than 22 minutes to commute one-way. If the standard deviation of such commutes is 6.5 minutes, what is the mean commute?
Assume that the traffic to the web site of Smiley's People, Inc., which sells customized T-shirts, follows a normal distribution, with a mean of 4.48 million visitors per day and a standard deviation of 900,000 visitors per day. (a) What is the probability that the web site has fewer than 5 million visitors in a single day? If needed, round your answer to four decimal digits, (b) What is the probability that the web site has 3 million or more visitors in a single day? If needed, round your answer to four decimal digits. (e) What is the probability that the web site has between 3 million and 4 million visitors in a single day? If needed, round your answer to four decimal digits. (d) Assume that 85% of the time, the Smiley's People web servers can handle the daily web traffic volume without purchasing additional server capacity. What is the amount of we traffic that will require Smiley's People to purchase additional server capacity? If needed, round your answer to two decimal digits.…
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