Answer:
Explanation:
1. Let 6th score = x
2. (8 + 19 + 11 + 21 + 4 + x) ÷ 6 ≥ 18
3. (8 + 19 + 11 + 21 + 4 + x) ÷ 6 ≥ 18
8 + 19 + 11 + 21 + 4 + x ≥ 18 × 6
63 + x ≥ 108
x ≥ 45
4. I don't think Mark will be able to accomplish his goal because 45 is too far from the average of the 5 scores