5.12. The following data are for 29 samples each of 100-

yd lengths of woolen goods. The woolen goods pass slowly across a table and nonconformities noted are marked by passing a bit of yarn of contrasting color through the goods.

Nonconformities: 2, 0, 0, 1, 1, 2, 2, 1, 0, 1, 1, 0, 2, 1, 1, 5, 0, 3, 1, 1, 1, 2, 2, 1, 0, 0, 0, 1, 4. Analyze the data by a c chart.

Why could we not treat as d values with n¼100 and make an np chart?