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Math Help - Normal distribution with an unknown mean and standard deviation

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    Normal distribution with an unknown mean and standard deviation

    If you spend less than one minute brushing your teeth about 40% of the time and more than two minutes brushing 2% of the time, what are the mean and standard deviation of the normal distribution for the amount of time you brush your teeth?
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    Quote Originally Posted by cb113 View Post
    If you spend less than one minute brushing your teeth about 40% of the time and more than two minutes brushing 2% of the time, what are the mean and standard deviation of the normal distribution for the amount of time you brush your teeth?
    Answered here: http://www.mathhelpforum.com/math-he...tion-mean.html

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