Mathematics, 11.02.2020 20:42 haybaby312oxdjli

In a class in which the final course grade depends entirely on the average of four equally weighted 100-point tests, Gloria has scored 90, 80, and 86 on the first three. What range of scores on the fourth test will give Gloria a B for the semester (an average between 80 and 89, inclusive)? Assume that all test scores have a non-negative value. Express your answer in interval notation.

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In a class in which the final course grade depends entirely on the average of four equally weighted...