Mariah's scores on her first five algebra tests are 89%, 92%, 85%, 93%, and 67%. She retakes the last test and improves her score from 67% to 87%.
Part A: The measure of center that will be most affected by the new score is the? )

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.