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Question

If my average for a class is a 91% and I got an 82% on the next test, what would my average be? Would it stay the same?

Answer 1

somewhere between 82 and 91. If the 91 represented twice as many tests or weight as the 82 test, then your new average would be (2(91)+82))/3= (182+82)/3 = 264/3 = 88.

You need a little more information to narrow it down as to exactly where you are. But you know you're somewhere between 82 and 91. Average of 82 and 91 is 173/2 = 86.5

A WAG, "best educated guess" in more formal phrasing, might be between 87 and 90.