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The owner of a gasoline service station wants to study gasoline-purchasing habits by motorists at his station. A random sample of 60 motorists during a certain week is selected with following results. Amount purchased = 11.3 liters, S = 3.1 liters 11 motorists purchased super unleaded gasoline

(1) At the 0.05 level of significance, is there evidence that the average purchase is different from 10 liters?
(2)At the 0.05 level of significance, is there evidence that less than 20% of the motorists purchase super unleaded gasoline?

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