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80th Percentile
A value below which 80 percent of the data in a data set falls, indicating the upper 20% of values.
Mean
The average of a set of numbers, calculated by summing all numbers in the set and then dividing by the count of numbers.
Standard Normal
A special case of the normal distribution with a mean of zero and a standard deviation of one.
Random Variable
A random variable is a variable whose values depend on outcomes of a random phenomenon, used in probability and statistics to model real-world processes.
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