One hundred insurance claim forms are inspected daily at Full Life Insurance Co. over 25 working days, and the number of forms with errors have been recorded in the table below.

Sample Number 1 2 3 4 5 6 7 8 9 10 11 12 13

Number of forms with errors 3 3 3 2 0 3 0 1 7 3 2 0 0

Sample size 100 100 100 100 100 100 100 100 100 100 100 100 100

Sample Number 14 15 16 17 18 19 20 21 22 23 24 25

Number of forms with errors 4 1 2 4 0 1 1 0 2 8 1 4

Sample size 100 100 100 100 100 100 100 100 100 100 100 100

a) Construct a p-chart. (32)

b) If any points occur outside the control limits, assume that assignable causes have been determined. Then construct a revised chart.