Ten samples of $15$ parts each were taken from an ongoing process to establish a p$-$chart for control. The samples and the number of defectives in each are shown in the following table:

SAMPLE n NUMBER OF DEFECTIVE ITEMS IN THE SAMPLE

$1152$

$2152$

$3152$

$4150$

$5152$

$6151$

$7153$

$8152$

$9151$

$10153$