Returns the alpha-percentile of data values in an array.
Data represents the array of data.
Alpha represents the percentage of the scale between 0 and 1.
A percentile returns the scale value for a data series which goes from the smallest (Alpha=0) to the largest value (alpha=1) of a data series. For Alpha = 25%, the percentile means the first quartile; Alpha = 50% is the MEDIAN.
The difference between PERCENTILE.INC and PERCENTILE.EXC is that, in the PERCENTILE.INC function the value of alpha is within the range 0 to 1 inclusive, and in the PERCENTILE.EXC function, the value of alpha is within the range 0 to 1 exclusive.
=PERCENTILE.INC(A1:A50;0.1) represents the value in the data set, which equals 10% of the total data scale in A1:A50.