$20.$ Consider a production process that produces tires. A quality engineer has taken $15$ samples, each containing $200$ tires. The total number of defective tires over the $15$ samples is $340.$ The LCL for the control chart constructed using two sigma is Ans$\_\_\_\_\_\_$

a$)0\mathrm{.}022.$

b$)0\mathrm{.}036.$

c$)0\mathrm{.}048.$

d$)0\mathrm{.}066.$