Apple numbers User Manual

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Chapter 12
    Dictionary of Functions 
 
PERCENTILE
The PERCENTILE function finds the value within a range of values that corresponds to a 
particular percentile.
PERCENTILE(datapercentile)
 data:  A range of cells containing the data.
 percentile:  The percentile value you want to find.
  
PI
The PI function returns the approximate value of pi, the ratio of a circle’s circumference 
to its diameter, accurate to 15 decimal places.
PI()
 No arguments (but you must include the parentheses).
  
Examples
Given the following table:
  
PERCENTILE(A2:E2, 0.5) returns 80, the 50th percentile of the range.
PERCENTILE(A4:E4, 0.5) returns 90, the 50th percentile of the range.
Examples
PI() returns 3.14159265358979.
SIN(PI()/2) returns 1, the sine of PI/2 radians or 90 degrees.