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

Question

Quizplus · Accepted Answer

The lower control limit (LCL) for a C chart is calculated using the formula LCL = C̄ - z√C̄, where C̄ is the average number of complaints. Here, C̄ = 127/30 = 4.23. Using z = 3, LCL = 4.23 - 3√4.23 = 0.00, since LCL cannot be negative.

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