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The Practice of Statistics | 5th Edition | ISBN: 9781464108730 | Authors: Daren S. Starnes, Josh Tabor
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Brush your teeth The amount of time Ricardo spends brushing his teeth follows a Normal

Chapter 2, Problem 62

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QUESTION:

Brush your teeth The amount of time Ricardo spends brushing his teeth follows a Normal distribution with unknown mean and standard deviation. Ricardo spends less than one minute brushing his teeth about 40% of the time. He spends more than two minutes brushing his teeth 2% of the time. Use this information to determine the mean and standard deviation of this distribution.

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QUESTION:

Brush your teeth The amount of time Ricardo spends brushing his teeth follows a Normal distribution with unknown mean and standard deviation. Ricardo spends less than one minute brushing his teeth about 40% of the time. He spends more than two minutes brushing his teeth 2% of the time. Use this information to determine the mean and standard deviation of this distribution.

ANSWER:

Step 1 of 2

Given,

Percent of the time, Ricardo spends less than one minute brushing his teeth = 40%

Percent of the time, Ricardo  spends more than two minutes brushing his teeth = 2%

Percent of the time, Ricardo  spends less than two minutes brushing his teeth = 100 - 2 = 98%

Using this information we have to determine the mean and standard deviation of the flight time distribution.

 

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