Month $123...222324$

Late Arrivals $324...332$

Assuming the average number of late arrivals $=2\mathrm{.}79,$ determine control limits

for an appropriate control chart $($with $3-$sigma limits$)$ to monitor the situation.

Question $9$Select one:

a$.$

UCL $=8\mathrm{.}7$ ; LCL $=0$

b$.$

UCL $=7\mathrm{.}8$; LCL $=0$

c$.$

UCL $=6\mathrm{.}5$ ; LCL $=1\mathrm{.}2$

d$.$

UCL $=5\mathrm{.}6$ ; LCL $=2\mathrm{.}3$