staxmillz
01.03.2021 •
Mathematics
In a class in which the final course grade depends entirely on the average of four equally weighted 100-point tests, Lisa has scored 83, 79, and 87 on the first three. What range of scores on the fourth test will give Lisa 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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