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What is the standard deviation of the age of 30 students in a class?

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What is the standard deviation of the age of 30 students in a class?  [#permalink]

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New post 03 Oct 2018, 19:43
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A
B
C
D
E

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  25% (medium)

Question Stats:

82% (00:26) correct 18% (00:34) wrong based on 25 sessions

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What is the standard deviation of the age of 30 students in a class?

[1] The sum of age of 30 students is 360

[2] Each of the student is 12 years old
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Re: What is the standard deviation of the age of 30 students in a class?  [#permalink]

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New post 03 Oct 2018, 19:49
Statement 1 is insufficient as no info is given about individual age.

Statement 2 tells us that each of the 30 students age is 12. Then SD will be zero.

B is the answer.
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Re: What is the standard deviation of the age of 30 students in a class?   [#permalink] 03 Oct 2018, 19:49
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What is the standard deviation of the age of 30 students in a class?

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