Issue with IASSC Black Belt Evaluation Exam Question

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February 8, 2021 at 11:38 am #252332

Rachid Bekani
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I purchased the IASSC Black Belt Evaluation Exam one question in the set said :

From this control chart with a center line indicated by line number 4, which of the following observation numbers is more than 2 sigma from the mean?

the proposed answers are :

A) 5
B)9
C) 13
D) 15
E)17
F)23

trying to synthesize the elements to answer the questions, it seems to me that something is missing.
Finally I sent an email to IASS They answered me that the question is fair and complete.
Now I find the basis for answering the question.
Any ideas?
thank you

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February 16, 2021 at 4:22 pm #252456

Bob Rome
★ 10 Years ★
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Are the control limits shown on the chart?

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