# Normal distribution with Mean Absolute Deviation What percent lies within 1,2 AbsDev

#### datanewb

##### New Member
Roughly 95% of the normal distribution lies within 2 standard deviations. However, recently I have begun using the mean absolute deviation a lot. What percent of the normal distribution is within 2 mean absolute deviations? Is this possible to calculate?

#### shahnawaz

##### New Member
Re: Normal distribution with Mean Absolute Deviation What percent lies within 1,2 Abs

For the normal distribution, the ratio of mean absolute deviation to standard deviation is sqrt(2/pi) = 0.79788456..
From this, we can say that roughly 89% of data lies within 2 mean absolute deviations.
http://en.wikipedia.org/wiki/Absolute_deviation