SOLUTION: Evie has scores of 72, 78, 80, and 84 on four Science quizzes. What score must she get on the next quiz to have an average of at least 80? Write the inequality. use x for the vari

Question 1171092: Evie has scores of 72, 78, 80, and 84 on four Science quizzes. What score must she get on the next quiz to have an average of at least 80?
Write the inequality. use x for the variable.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
mean-total/n
80=total/5, so total must be at least 400
the total is 314 from the 4
that leaves 86 as the minimum score needed.
-
72 is -8 from 80
78 is -2
80 is the same
84 is +4
the sum of the differences is -6. So the next quiz needs to be +6 or 86.
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