Question

The scores of James in his math test are 75, 78, 89, and 71. What score on the next test will make James’ average at least 80 ?

x > 87
x > 87
x < 87
x < 87

Answer 1

Answer: x ≥ 87

Explanation:

Set the minimum score on the next test as x & calculate it:

`(75+78+89+71+x)/(5) =80\\\\75+78+89+71+x=80(5)\\\\313+x=400\\\\x=400-313=87`

So they need at least a score of 87 for the average to be 80+.

Answer 2

x ≥ 87

Explanation: