standard deviation of 10.4, 9.8, 10.0, 9.2, 10.5, 9.8, 9.9, 10.1, 10.4, 10.2, 10.7,

bigsmile1k

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Sep 9, 2016
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What is approximate standard deviation for the list of


numbers: 10.4, 9.8, 10.0, 9.2, 10.5, 9.8, 9.9, 10.1,


10.4, 10.2, 10.7, 9.6?


A. 2.1
B. 1.9
C. 1.75
D. 1.8


The question shows up on my kid's test recently.


The standard deviation is 0.42. Why can the answer be C.


1.75?


If 0.42 is the correct standard deviation, the answer


choice 1.75 is TOO LARGE to be called an "approximate",


so there is not a valid or or reasonable answer. So, the


question is not valid and should be excluded from the


test score.


Anyone agreee? Please correct me if my thoughts are


wrong.
 
Seems to me that there is something wrong with the question and/or answer. I'd be questioning it too.

What was the exact wording of the question? Did it follow on from anything else?
 
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