Question: In a class in which the final course grade depends entirely on the average of four equally weighted 100-point tests, Brad has scored 83, 95,

In a class in which the final course grade depends entirely on the average of four equally weighted 100-point tests, Brad has scored 83, 95, and 76 on the first three. What range of scores on the fourth test will give Brad 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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