Returns the F probability distribution. You can use this function to determine whether two data sets have different degrees of diversity. For example, you can examine the test scores of men and women entering high school and determine if the variability in the females is different from that found in the males.

Parameters :

	X	is the value at which to evaluate the function.
	Degrees_freedom1	is the numerator degrees of freedom.
	Degrees_freedom2	is the denominator degrees of freedom.