A student takes 40 units to 100 in a test. Teacher announces that this test and the next test wheels are averaged together for quality. The student wonders if caould get a C if it gets to 100 for the next test. He has reasons "I think my average (mean) is 70 because half of 40 is 20 and half of 100 is 50. This is a C because 20 plus 50 is 70. "Does the methood always work? explain your reasoning.

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sorry, "in case of three tests" i meant!!

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