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# Outliers watch

1. How many outliers are there in the following data: 47, 19, 25, 29, 4, 52, 22, 36, 21, 25?

How do i go about this? as in how do i find the upper and lower quartiles? and then from here how do i identify the outliers? i missed this lesson in school!

thanks guys!
2. An outlier is any number which is x<LQ - 1.5 * IQR or x>UQ +1.5 *IQR
3. (Original post by Deep456)
An outlier is any number which is x<LQ - 1.5 * IQR or x>UQ +1.5 *IQR
but how do i find the quartiles?
4. (Original post by abey_27)
but how do i find the quartiles?
If there is an odd number of numbers. Then Lower Quartile is 1/4 of all the values to the nearest number. For example 9 numbers so 1/4 = 2 1/4 so the lower quartile is the 3rd number. Upper quartile is 3/4 of all the values.

If even then to find lower quartile, you divide by 4 and take the mean of that number and the next number.

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Updated: October 13, 2009
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