A manufacturer produced a wallpaper in the form of large rolls and the specification of each roll is the 3-meter length and 1-meter width. A sample taken of each completed roll and inspected for non-conformities which are identified inconsistent thickness, discolouration, and inconsistent moisture content. 20 samples have been collected randomly and recorded as shown in the following table.

Sample No. of Non- Sample No. of Non- Sample No. of Non- Sample No. of Non- No. Conformities No. Conformities No. Conformities No. Conformities 1 10 6 11 11 9 16 10 2 11 7 14 12 23 17 12 12 8 10 13 12 18 7 4 9 9 8 14 8 19 9 5 13 10 10 15 11 20 11