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A tutor promises that 10% of her students will obtain an A on every test they write. For the last test, the mean mark was

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A tutor promises that 10% of her students will obtain an "A" on every test they write. For the last test, the mean mark was 68 and the standard deviation was 6. What mark is required to receive an "A" on the test? Round your answer to the nearest whole number

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