Distribution

Each band of the curve has a width of 1 Standard Deviation

Each band of the curve has a width of 1 Standard deviation from the Mean Value.

1 Standard Deviation away account for 68.27%.

2 standard deviations away account for 95.45%.

3 standard deviations away account for 99.73%.

Most observations are within 1 standard deviation from the mean. Almost all observations are within 2 standard deviations. Practically all observations are within 3 standard deviations.

Symmetric. The peak always divides the distribution in half.

Probability distribution. A lot of observations follow the normal distribution:

Normal distribution shows that values near the mean are more frequent than values far from the mean:

1 Standard deviation 68.27% 2 Standard deviations 95.45% 3 Standard deviations 99.73%