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1.The weekly salaries of six employees at McDonalds are $140, $220, $80, $180, $160, $120. For these six salaries, find the mean. 2.Andy has grades of 84, 65, and 76 on three math tests. What grade must he obtain on the next test to have an average of exactly 80 for the four tests? 3.On his first three quizzes, Patrick earned a 15, 18, and 16. (A perfect score would have been 20 points.) What does he need to earn on the next quiz to have a mean score of at least 17?