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.
I think you're exactly right. None of those answers are really even close to the actual standard deviation.
Choice C is the closest of the four, but it's still way off.