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Describe the role of a moderator in a fission reactor, and give examples of two substances that are used as moderators.
Variance
A measure of how much values in a dataset differ from the mean, indicating the distribution's spread.
Standard Deviation
The measure of the dispersion of a set of values relative to its mean, indicating how spread out the values are.
Standard Normal Curve
A bell-shaped curve that is symmetric about the mean, representing the distribution of a standard normal variable with a mean of zero and a variance of one.
Mean
The arithmetic average of a set of numbers, calculated by dividing the sum of all values by the count of the values.
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