A quality consultant was asked to analyze the data from order errors at the Audubon Books, Inc., distribution centre as shown below. The data represent a typical order processed in each month and show the errors found in those orders. Any order can have errors from a number of causes, such as the wrong item or incorrect customer information. Develop a u-chart for these data.

Sample Defects Sample Size 1 7 170 2 10 153 3 5 167 4 2 153 5 10 157 6 8 191 7 5 203 8 8 205 9 2 175 10 9 169 11 1 153 12 3 151 13 0 171 14 10 173 15 4 192 16 6 189 17 3 181 18 7 151 19 3 167 20 0 162

Select ALL the samples where the upper control limit (begin mathsize 20px style U C L subscript u end style) is greater than 0.07.

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