In a class in which the final course grade depends entirely on the average of four equally weighted 100-point tests, Gloria has scored 89 89 , 81 81 , and 83 83 on the first three. What range of scores on the fourth test will give Gloria a C for the semester (an average between 70 70 and 79 79 , inclusive)? Assume that all test scores have a non-negative value.

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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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, Gloria has scored
89
89
,
81
81
, and
83
83
on the first three. What range of scores on the fourth test will give Gloria a C for the semester (an average between
70
70
and
79
79
, inclusive)? Assume that all test scores have a non-negative value.

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