Learning and Teaching for Mathematical Literacy

From the linked document:

Simpson’s Diversity Index is used to calculate a measure of diversity, taking into account the number of something as well as its abundance. The index is most often used for ecological studies that measure species diversity, but the same analysis can also be applied to other principles, such as the diversity of opinion on an idea over a geographical space.

This is part of the RGS's Student guide to the A Level independent investigation