PERCENTRANK function

Returns the percentage rank of a value in a data set


 * PERCENTRANK(array,x,[significance])
 * Array - the array or range of data with numeric values that defines relative standing.
 * X - The value for which you want to know the rank.
 * Significance (optional) - a value that identifies the number of significant digits for the returned percentage value. If omitted, PERCENTRANK uses three digits (0.xxx).
 * If array is empty, PERCENTRANK returns the #NUM! error value.
 * If significance < 1, PERCENTRANK returns the #NUM! error value.
 * If x does not match one of the values in array, PERCENTRANK interpolates to return the correct percentage rank.