Final answer:
Vicky needs to earn a total of 510 points across her 6 tests to achieve an average score of 85%.
Step-by-step explanation:
If Vicky wants to achieve an average score of 85% on her 6 tests, where each test is out of 100 points, then we need to calculate the total points she needs. To find this, we multiply the average desired score by the number of tests:
85% of 100 points is 85 points per test. For 6 tests, the calculation is 85 points/test × 6 tests = 510 points total.
Vicky must therefore aim to earn a total of 510 points across all her tests to achieve an average of 85%.