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Suppose that 20 percent of the students who took a certa

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Suppose that 20 percent of the students who took a certain test were from school A and that the arithmetic average of th

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Suppose that 20 percent of the students who took a certain test were from school A and that the arithmetic average of their scores on the test was 80. Suppose also that 30 percent of the students were from schoolB and that the arithmetic average of their scores was 76. Suppose, finally, that the other 50 percent of the students were from school C and that the arithmetic average of their scores was 84. If a student is selected at random from the entire group that took the test, what is the expected value of her score?

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