Variant: rectangular distribution
The continuous distribution on (a, b) with probability density function f given by

1/12(b − a)2.
The error when a decimal number is rounded to the nearest whole number has a uniform distribution on (−0.5, 0.5), with mean error 0 and variance
1/12

Uniform distribution, continuous. The density function is constant for all values of the random variable in the given range, which implies that all intervals of the same width in this range are equally likely.
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