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# A scientist recorded the number of eggs in each of 10 birds

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Joined: 10 Oct 2005
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A scientist recorded the number of eggs in each of 10 birds [#permalink]

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30 Sep 2006, 16:38
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A scientist recorded the number of eggs in each of 10 birdsâ€™ nests. What was the standard deviation of the numbers of eggs in the 10 nests?
(1) The average (arithmetic mean) number of eggs for the 10 nests was 4.
(2) Each of the 10 nests contained the same number of eggs.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is
sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
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Joined: 25 Jun 2006
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30 Sep 2006, 21:49
B.

2) is enough to say there is no spread. so SD = 0
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Joined: 14 Sep 2006
Posts: 198
Schools: Olin Business School - Washington University

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01 Oct 2006, 08:08
Oh....ya...B. This is why I am nervous on Q.
01 Oct 2006, 08:08
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# A scientist recorded the number of eggs in each of 10 birds

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