Question

Can somebody help me with this plz......

Answer 1

He must score 83 in the last test.

Explanation:

To get a mean of 80 Terry must score a total of 4*80 = 320 over the 4 tests.

So his score for the last test must be 320 - (71 + 80 + 86)

= 320 - 237

= 83.