Simplify the factorial expression. 
Definitions:
Median Number
Median number is the middle value in a list of numbers arranged in order, separating the higher half from the lower half of the dataset.
Mean
The arithmetic average of a dataset, calculated by adding up all the numbers in a dataset and dividing by the count of those numbers.
Median
The middle value in a dataset when it is ordered from smallest to largest, or the mean of the two middle values if the dataset has an even number of observations.
Distribution Shape
Refers to the geometric arrangement of data points in a distribution, common shapes include normal, skewed, or bimodal distributions.
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