Oliver's Pizza Shop Tracks Customer Complaints Every Day and Then

Multiple Choice

Oliver's pizza shop tracks customer complaints every day and then follows up with their customers to resolve problems. For the past 30 days, they received a total of 127 various complaints from unhappy customers.
-Calculate the lower control limits for the C chart using z = 3

A) 4.23
B) 2.06
C) 10
D) 0.00
E) 10.41