Question: In a class in which the final course grade depends entirely on the average of four equally weighted 100-point tests, Paul has scored 75 ,

In a class in which the final course grade depends entirely on the average of four equally weighted 100-point tests, Paul has scored 75 , 80 , and 91 on the first three. What range of scores on the fourth test will give Paul a C for the semester (an average between 70 and 79 , inclusive)? Assume that all test scores have a non-negative value. Express your answer in interval notation

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