SOLUTION: In a class in which the final course grade depends entirely on the average of four equally weighted 100-point tests, Mark has scored 76 , 94 , and 77 on the first three. What

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Question 1201921: In a class in which the final course grade depends entirely on the average of four equally weighted 100-point tests, Mark has scored 76
, 94
, and 77
on the first three. What range of scores on the fourth test will give Mark a C for the semester (an average between 70
and 79
, inclusive)? Assume that all test scores have a non-negative value.
Answer by math_helper(2461)   (Show Source): You can put this solution on YOUR website!







Multiply by 4 and partly simplify middle term:





Subtract 247 from all three sides:





Mark needs to score in the range 33 to 69, inclusive, to obtain a C.   

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