Name:____________________________
Empirical Rule


In a normally distributed population

How much of the data is ≥ the mean:_____%
How much of the data is ≤ the mean:_____%


How much of the data is within 1 SD of the mean:______%
                     [____,____]
How much of the data is within 2 SDs of the mean:______%
                     [____,____]
How much of the data is within 3 SDs of the mean:______%
                     [____,____]

The area under the curve is 1.
How much area is within 1 SD of the mean:______  (not %)
How much area is within 2 SDs of the mean:______
How much area is within 3 SDs of the mean:______

The probability that a randomly selected datum is within 1 SD of the mean:______  (not %)
The probability that a randomly selected datum is within 2 SDs of the mean:______
The probability that a randomly selected datum is within 3 SDs of the mean:______


Learn the "slices"
How much between the mean and mean+1 SD:______
How much between the mean and mean-1 SD:______
How much between mean+1 SD and 2 SD:______
How much between mean-1 SD and mean-2 SD:______
How much between mean+2 SD and mean+3 SD:______
How much between mean-2 SD and mean-3 SD:______

How much that is more than two SDs from the mean:_______

How much between mean-1 SD and mean+2 SD:______
How much between mean-2 SD and mean+1 SD:______