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

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Joined: 06 Nov 2008
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A scientist recorded the number of eggs in each of 10 birds [#permalink] New post 08 Nov 2008, 18:47
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A scientist recorded the number of eggs in each of 10 birds’ 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.
Answer:
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Joined: 28 Dec 2004
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Re: eggs---29 [#permalink] New post 08 Nov 2008, 19:36
i will say B

SD=0 if each nest has the same number of eggs
Re: eggs---29   [#permalink] 08 Nov 2008, 19:36
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A scientist recorded the number of eggs in each of 10 birds

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