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9.A recent survey found the following distribution for the number of hours a person sleeps per night. Less than 6 hours126 hours267 hours308 hours28More than

9.A recent survey found the following distribution for the number of hours a person sleeps per night.

Less than 6 hours126 hours267 hours308 hours28More than 8 hours4100

Find the probability that the person sleeps fewer than 7 hours per night.Enter your answer as a reduced fraction a/b.

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