Perform the indicated operation. 
Definitions:
Mean
The average value of a set of numbers, obtained by dividing the sum of all the numbers by the count of numbers.
Percentile Points
Points or values below which a certain percentage of observations in a dataset fall, used to measure the relative standing of a value within a dataset.
F Distribution
A probability distribution that arises in the analysis of variance and is used in hypothesis testing and confidence interval estimation for two sample variances.
F Distribution
A probability distribution used in analysis of variance (ANOVA), among other tests, describing the ratio of variances from two normally distributed populations.
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