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The interquartile range is a measure of "spread" in a collection of data. It is the difference between the 25th and 75th percentiles. The higher the IQR, the greater the spread of values around the median.

From the Reference Library

A New Home for tutor2u Resources

We've just flicked the switch on moving all our digital resources to instant digital download - via our new subject stores.

For every subject you can now access each digital resource as soon as it is ordered. This will always be the latest edition of each resource too (and we'll update you automatically if there is an upgraded version to use).

Simply add the required resources to your cart, checkout using the usual options and your resources will be available to access immediately via your mytutor2u account.