Question

Mrs. Angle has 12 students in her advanced algebra class. On a recent test, the average was 80. When Beth asked for her score, Mrs Angle could not find it, but she did remember adding Beth's score in the average. She also remembered Beth had passed. These are the scores of the other students

65, 65, 70, 70, 80, 85, 90, 90, 90,100.

What is Beth's score?

Answer 1

• 75

Explanation:

Let the Beth's score is x.

The average is 80.

Solve the following equation:

• average = sum / number

• (65*2 + 70*2 + 80 + 85 + 90*3 + 100 + x)/11 = 80
• 805 + x = 80*11
• x = 880 - 805
• x = 75

Beth's score was 75