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

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Intern
Joined: 06 May 2015
Posts: 45
Location: India
Schools: Darden '21
GPA: 4
What is the standard deviation of the age of 30 students in a class?  [#permalink]

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03 Oct 2018, 18:43
00:00

Difficulty:

25% (medium)

Question Stats:

80% (00:24) correct 20% (00:34) wrong based on 23 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
Director
Joined: 18 Jul 2018
Posts: 679
Location: India
Concentration: Finance, Marketing
WE: Engineering (Energy and Utilities)
Re: What is the standard deviation of the age of 30 students in a class?  [#permalink]

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03 Oct 2018, 18:49
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.

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Re: What is the standard deviation of the age of 30 students in a class?   [#permalink] 03 Oct 2018, 18:49
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