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    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!
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    An outlier is any number which is x<LQ - 1.5 * IQR or x>UQ +1.5 *IQR
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    (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?
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    (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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