Answer:
85
Step-by-step explanation:
Average is calculated as
average = [tex]\frac{total}{count}[/tex]
After 6 tests
[tex]\frac{total}{6}[/tex] = 83 ( multiply both sides by 6 )
total = 83 × 6 = 498
New total after test 7 = 498 + 97 = 595, hence
new average = [tex]\frac{595}{7}[/tex] = 85
