Kevin's fifth test score must be at least 93%
Given;
the scores for the first four tests = 71%, 69%, 84%, and 83%
the score of the fifth test = x
average of the test score = at least 80%
To find x:
The sum of the first four test scores = 71% + 69% + 84% + 83% = 307
The fifth test score is calculated as follows;
[tex]\frac{307 + x}{5} = 80\\\\307 + x = 5(80)\\\\307 + x = 400\\\\x = 400 - 307\\\\x = 93 \%[/tex]
Thus, Kevin must score 93% in his fifth test to have an overall average of at least 80%
To learn more about averages, please visit: https://brainly.com/question/9101501
