One property of normally distributed data is that 99.7 percent of all possible observations of process output occur within plus-or-minus three standard deviations of the process mean.

Name: One property of normally distributed data is that 99.7 percent of all possible observations of process output occur within plus-or-minus three standard deviations of the process mean.
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This is known as the "Empirical Rule" or the "68-95-99.7 Rule" and is a characteristic of a normal distribution.

One Property of Normally Distributed Data Is That 99