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bell curve
Colin saw the Dumper/Dumpee dichotomy on a bell curve.
John Green -- An Abundance of Katherines
the shape of a statistical graph that is symmetrical about the mean with the most probable scores concentrated near the mean
Progressively less likely scores occur further away from the mean. 68.26% of the scores lie within one standard deviation either side of the mean, 95.44% of the scores lie within 2 standard deviations either side of the mean and 99.75% fall within three standard deviations.
psy.st-andrews.ac.uk/resources/glossary.shtml
The exact shape of the bell curve is determined by the standard deviation. The mean and median are at the same point. Also called: normal curve
Colin saw the Dumper/Dumpee dichotomy on a bell curve.
John Green -- An Abundance of Katherines
The cover sheet plotted a rough-looking bell curve of speed solutions, and below it was the noise prediction curve.
Tom Clancy -- The Hunt for Red October
He drew a bell curve on his office pad, suggesting that Brett’s somnambulism would reach a peak, hold for a while, then begin to taper off.
Stephen King -- Cujo
Hence the bell curve: The majority of people fall somewhere close to the vertical dividing line with the occasional statistical outlier (e.g., me) representing a tiny percentage of overall individuals.