normal curve

noun Statistics.
a bell-shaped curve showing a particular distribution of probability over the values of a random variable. Also called Gaussian curve, probability curve. Compare illus. under bell-shaped curve.

Origin:
1890–95

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World English Dictionary
normal curve
 
n
statistics a symmetrical bell-shaped curve representing the probability density function of a normal distribution. The area of a vertical section of the curve represents the probability that the random variable lies between the values which delimit the section

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Raw data were taken from seven subject areas, and normal curve equivalents from these seven areas were selected as data elements.
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