Question 1144581
i think you're right.
let x = the third test score.
you get (88 + 78 + x) / 3 >= 80
multiply both sides of this equaiton by 3 to get:
88 + 78 + x >= 240
solve for x to get:
x >= 74.


when x = 74, the average is (88 + 78 + 74) / 3 = 80.


when x is greater than 74, the average will be greater than 80.