The following data were used to construct the histograms of the number of days required to fill orders for Dawson Supply, Inc., and J.C. Clark Distributors.   Dawson Supply Days for Delivery: 11 10 9 10 11 11 10 11 10 10 Clark Distributors Days for Delivery: 9 10 13 7 10 11 10 7 14 12      J.C. Clark standard deviation

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