Question

A hotel tracks the number of complaints per month. When the process is in control, there is an average of 35 complaints per month. Assume that a 2-sigma control limit is used. What is the lower control limit?

Answer 1

Answer:

Thus, the lower-2 sigma limit is 23.17                  

Step-by-step explanation:

We are given the following in he question:

Average complaints per month = 35

$np = 35$

A 2-sigma control limit is used.

We have to find the lower control limit.

$np-2\times \sqrt{np}$

Putting values, we get,

Lower limit:

$35 - 2\times \sqrt{35}\\23.17$

Thus, the lower-2 sigma limit is 23.17