Please read the case study given below and answer questions given at the end.

A manufacturing plant make wind mill assemblies & can produce 50 units in a month in two period of 15 days each ; following is the data for number of defects arising per month.

Month

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

Number of Defects per period

43

32

1 0

4 5

6 7

7 7

96

5 4

2 3

0 2

2 3

4 3

Make the appropriate control chart on a graph paper