A toy-manufacturing company has been given a large order for small plastic whistles that will be given away by a large fast-food hamburger chain with its kid€™s meal. Seven random samples of four whistles have been taken. The weight of each whistle has been ascertained in grams. The data are shown here. Use these data to construct an xÌ„ chart and an R chart. What managerial decisions should be made on the basis of thesefindings?

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Sample 1 4.1 5.2 3.9 5.0 Sample 2 3.6 4.3 3.9 4.6 Sample 3 4.0 4.8 Sample 4 4.6 4.8 4.7 4.7 Sample 5 3.9 3.8 4.6 4.9 Sample 6 5.1 4.7 4.8 4.3 Sample 7 4.6 4.4 4.0 4.5 5.3