The standard deviation of the distribution (also called sigma).
- iOS 9.0+
- macOS 10.11+
- Mac Catalyst 13.0+
- tvOS 9.0+
One deviation is defined such that 68.27% of values generated by the distribution are within one deviation of the
mean value, 95% of generated values are within two deviations, and 100% of generated values are within three deviations. Values within two deviations of the mean have a 95% probabilty, and values within three deviations have a 100% probability.
This property is read-only—GameplayKit automatically calculates its value based on those of the inherited
highest properties such that those values are each three deviations away from the mean (
deviation = (highest - lowest) / 6).