A shirt manufacturer buys cloth by the 100- yard roll from a supplier. For setting up a control chart to manage the irregularities (e. g., loose threads and tears), the following data were collected from a sample provided by the supplier.

a. Using these data, set up a c- chart with z = 2.
b. Suppose the next five rolls from the supplier had three, two, five, three, and seven irregularities. Is the supplier process undercontrol?

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SAMPLE 2 3 4 5 6 7 8 9 10 IRREGULARİ TES 35 26 5 4 63