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## Information

### Tukey's fences

Q1 - Lower quartiles.

Q3 - Upper quartiles.

Interquartile Range : IRQ = Q3 - Q1.

Usually with k=1.5.

#### Lower fence formula

Lower fence = Q1 - k * IRQ.

#### Upper fence formula

Upper fence = Q3 + k * IRQ.

### Z-score

The data should be symmetrical.

#### Lower limit

Lower = Average - k * S.

#### Lower limit

Lower = Average - k * S.