Thread: 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?

Originally Posted by cb113

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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