of four equally weighted 100-point tests, Sarah has scored 89, 91, and 83 on the first three. What range of scores on the fourth test will give Sarah 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.
of four equally weighted 100-point tests, Sarah has scored 89, 91, and 83 on the first three. What range of scores on the fourth test will give Sarah 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.
Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter7: Applying Fractions
Section7.1: Ratios
Problem 25WE
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In a class in which the final course grade depends entirely on the average of four equally weighted 100-point tests, Sarah has scored 89, 91, and 83 on the first three. What range of scores on the fourth test will give Sarah 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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