You searched for: “normal distributions
normal distribution (s) (noun), normal distributions (pl)
The frequency of occurrence of a given series of data for each change in an independent variable; usually represented by a bell-shaped curve: The professor, Dr. Dean, used the concept of normal distribution when calculating the grades for her students.

When compared to students in other universities, the normal distribution of grades in English classes for Susan and the other students at the local university was favorable.

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