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##### Asked by: Liudmila Oxenfart

personal finance health insurance# What does Iqr stand for in math?

Last Updated: 25th April, 2020

**IQR**) is a measureofvariability, based on dividing a data set into quartiles.Quartilesdivide a rank-ordered data set into four equal parts. Thevaluesthat divide each part are called the first, second, andthirdquartiles; and they are denoted by Q1, Q2, andQ3,respectively.

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Also know, what is the Iqr in math?

The **IQR** describes the middle 50% of valueswhenordered from lowest to highest. To find the**interquartile**range (**IQR**), ?first find the median(middle value) of thelower and upper half of the data. These valuesare **quartile**1 (Q1) and **quartile** 3 (Q3). The**IQR** is the differencebetween Q3 and Q1.

Secondly, what is the 1.5 IQR rule? Interquartile **Rule** for Outliers All that we need to do is to is the following:Multiplythe interquartile range (**IQR**) by the number**1.5**. Add**1.5** x (**IQR**) to the third quartile. Anynumber greaterthan this is a suspected outlier. Subtract **1.5**x(**IQR**) from the first quartile.

In this way, how do you find the interquartile range?

To **find** the **IQR**, start by arrangingthenumbers in your data set from lowest to highest. Then, divideyourdata set in half and **find** the median of both the lowerandupper half. If you have an odd amount of numbers, don't includethemiddle number.

How do you explain outliers?

For example, the point on the far left in theabovefigure is an **outlier**. A convenient definition ofan**outlier** is a point which falls more than 1.5 timestheinterquartile range above the third quartile or below thefirstquartile. **Outliers** can also occur whencomparingrelationships between two sets of data.