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According to a fast food manager, the average number of customers between 8am to 11am is 10, with a variance of two. His friend from

According to a fast food manager, the average number of customers between

8am to 11am is 10, with a variance of two. His friend from other outlet does not

believe that the variance is two. He counts the number of customers in 15 other

outlets and obtained the following data:

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