Five data entry operators work at the data processing department of the Birmingham Bank. Each day for $30$ days, the number of defective records in a sample of $350$ records typed by these operators has been$$ noted, as$$ follows:

$$

Sample No$.$

No$.$ Defectives

Sample No$.$

No$.$ Defectives

Sample No$.$

No$.$ Defectives

$1$

$8$

$11$

$7$

$21$

$17$

$2$

$5$

$12$

$6$

$22$

$11$

$3$

$18$

$13$

$15$

$23$

$6$

$4$

$11$

$14$

$4$

$24$

$7$

$5$

$12$

$15$

$10$

$25$

$13$

$6$

$9$

$16$

$8$

$26$

$9$

$7$

$11$

$17$

$13$

$27$

$13$

$8$

$10$

$18$

$4$

$28$

$6$

$9$

$5$

$19$

$19$

$29$

$12$

$10$

$13$

$20$

$15$

$30$

$3$

Part $2$

$$a$)$ Establish $3$sigma upper and lower control limits$.$

UCL Subscript p $=$

$$

$9($enter your response as a number between $0$ and$1,$ rounded to three decimal$$ places$).$