Usually, the higher the literacy rate, the the life expectancy.

Usually, the higher the literacy rate, longer the life expectancy

Higher life expectancy because there's less stress on having to learn to read and write

Ghana, first of the great medieval trading empires of western africa (fl. 7th–13th century). it was situated between the sahara and the headwaters of the sénégal and niger rivers, in an area that now comprises southeastern mauritania and part of mali.