George’s average score on his math tests in the first quarter is 60. His average score on his math tests in the second quarter is 80. George’s semester score in math is the average of all the tests he took in the first and second quarters. Can he necessarily calculate his semester score by averaging 60 and 80? If so, explain why. If not, explain why not. Explain what other information you would need to calculate George’s semester average, and show how to calculate this average.

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