Best Answer

Order the observations.

Find the values of the observation that is a quarter of the way and three quarters of the way along the list of these ordered values. If necessary, interpolate between the values.

The difference between the two values is the inter-quartile range and half that is the semi- IQR, as required.

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Q: How do you find semi inter quarter range maths?
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How do you find the inter quartile range?

Subtract the lower quartile from the upper quartile.

Why do you multiply the interquartile range by 1.5 to find the outlier?

By definition a quarter of the observations are below the lower quartile and a quarter are above the upper quartile. In all, therefore, half the observations lie outside the interquartile range. Many of these will be more than the inter-quartile range (IQR) away from the median (or mean) and they cannot all be outliers. So you take a larger multiple (1.5 times) of the interquartile range as the boudary for outliers.

How do you find the range in maths?

The range is the highest value minus the lowest value.

How do you find the interquartile range of a data?

The Inter-quartile range is the range of the middle half of the data. It is the difference between the upper and lower quartile.Example: 35,80,100 110,120,120,170,180.The Inter-quartile range would be 145-90 or 55To find the interquartile range, you:1) Arrange the data in numerical order.2) Then find the median of the data sets.3) Find the median of the top half and bottom half. (of the set of numbers)4) The groups you now have are "quartiles"5) Find the interquartile range. (subtract the smaller range from the range)

How do you find the IQR of a set of data?

Iqr stands for inter quartile range and it is used to find the middle of the quartiles in a set of data. To find this, you find the lower quartile range and the upper quartile range, and divide them both together.

How do you find out range in maths sum?

In a normal case, you take the highest number and subtract it by the lowest answer

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