Red Top Cab Company receives multiple complaints per day about driver behavior.Over 9 days the owner recorded the number of calls to be 3,0,8,9,6,7,4,9,and 8.What is the upper control limit for the 3-sigma c-chart?
A)13.35
B)8.45
C)24.00
D)0.00
E)9.03

Question

Quizplus · Accepted Answer

To find the upper control limit for a 3-sigma c-chart, we use the formula UCL = c̄ + 3√c̄, where c̄ is the average number of calls per day.

c̄ = (3+0+8+9+6+7+4+9+8)/9 = 6.44

UCL = 6.44 + 3√6.44 = 13.35

Therefore, the upper control limit for the 3-sigma c-chart is 13.35. So, the best choice is A.

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