The bar graph shows students who appeared and passed in an examination for schools P, Q, R and S. Find the average success rate (percentage) of the four schools.
The four success rates are 280/500=56%, 330/600=55%, 455/700=65%, and 240/400=60%. Their arithmetic mean is (56+55+65+60)/4=**59.0%, C**. The requested mean of school percentages differs from the aggregate pass percentage.
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