Age and Size of Cash Offer – A consumer organization studied the effect of age on the size of cash

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Chicken Delight claims that 81 percent of its orders are delivered within 10 minutes of the time the order is placed. A sample of 80 orders revealed that 61 were delivered within the promised time. At the .10 significance level, can we conclude that less than 81 percent of the orders are delivered in less than 10 minutes?