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As the factory system progressed into the 1840s,
Standard Normal Variable
A random variable that follows a normal distribution with a mean of zero and a standard deviation of one.
Z-score
A measure of how many standard deviations an element is from the mean of its distribution.
Standard Normal Curve
A specific instance of a normally distributed curve where the mean is 0 and the standard deviation is 1.
Percentile
A statistical measure indicating the value below which a given percentage of observations in a group of observations fall.
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