The interquartile range can be calculated by subtracting

First quartile from the Third quartile

Third quartile from the First quartile

First quartile from the Third quartile

Second quartile from the Fourth quartile

First quartile from the Second quartile

The pth percentile of a distribution is such that

p percent of the observations fall at or below it

p percent of the observations fall at it

p percent of the observations fall below it

p percent of the observations fall at or below it

First quartile from the Third quartile

p percent of the observations fall at or below it

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