In Excel 2010, the FDIST() function was replaced with the F.DIST.RT() function, and the F.DIST.RT() function was added to increase the accuracy of the results. To ensure the backward compatibility of F.DIST.RT(), the FDIST() function is still available.
Definition. This function returns the values of a distribution function (1 alpha) of a right F-distributed random variable. Use this function to determine whether two data sets have different variances. For example, you can compare the survey results of three equal employee groups to determine whether the variance or results are different.
x (required). The value at which to evaluate the function