MathDB

At Durant University, an A grade corresponds to raw scores between

90

and

100

, and a B grade corresponds to raw scores between

80

and

90

. Travis has

3

equally weighted exams in his math class. Given that Travis earned an A on his first exam and a B on his second (but doesn't know his raw score for either), what is the minimum score he needs to have a

90\%

chance of getting an A in the class? Note that scores on exams do not necessarily have to be integers.

Problem Statement