Step 1

The normal distributions are bell-shaped. Therefore the empirical rule can be stated as below:

Step 2

For the bell-shaped distributed variable,

The observations that lie within 11 standard deviation from the mean is around \(68.26\%\).

The observations that lie within 22 standard deviations from the mean is around \(95.44\%\).

The observations that lie within 33 standard deviations from the mean is around \(99.74\%\).

The normal distributions are bell-shaped. Therefore the empirical rule can be stated as below:

Step 2

For the bell-shaped distributed variable,

The observations that lie within 11 standard deviation from the mean is around \(68.26\%\).

The observations that lie within 22 standard deviations from the mean is around \(95.44\%\).

The observations that lie within 33 standard deviations from the mean is around \(99.74\%\).