At Hershey's, the chocolate maker, a particular candy bar is supposed to weigh 11 ounces. However, the company has received complaints that the bars are under weight. To assess this situation, the company has conducted a statistical study that concluded that the average weight of the candy is indeed 11 ounces. However, a consumer organization, while acknowledging the finding that the mean weight is 11 ounces, claims that more than 50% of the candy bars weigh less than 11 ounces and that a few heavy bars pull the mean up, thereby cheating a majority of customers. A sample of 20 candy bars was selected. The data obtained follow:

Test the consumer organization's claim at a significance level of 0.05.

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