3
practice testMultiple Choice

Practice Test

Question 3 • Concepts in Probability and Statistics

Nora wants to find her average grade in her science class. She has earned a score of 85 percent on two tests, 92 percent on three tests, and 94 percent on her most recent test. What is Nora’s mean, or average, test score?

Answer
A
90 percent
B
90 point 3 percent
C
91 percent
D
89 point 2 percent

Explanation

There are 6 tests total: 2 + 3 + 1. Add the scores for all six tests: (2 × 85) + (3 × 92) + 94 = 540. Divide by 6 to find the mean: 540 ÷ 6 = 90 percent, so Nora’s average is 90 percent.

AI-written and checked against the verified answer.

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