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What was the average (arithmetic mean) monthly rainfall

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Eternal Intern
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What was the average (arithmetic mean) monthly rainfall [#permalink] New post 22 Jul 2003, 19:36
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Question Stats:

70% (02:04) correct 30% (01:38) wrong based on 10 sessions
What was the average (arithmetic mean) monthly rainfall during 1984 in region Y?

(1) In region Y the total rainfall for the first 6 months of 1984 was twice the total rainfall for the last 6 months of 1984.

(2) In region Y the average monthly rainfall for the first 6 months of 1984 was 2.31 inches more than the average monthly rainfall for the last 6 months of 1984.
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Re: What was the average (arithmetic mean) monthly rainfall [#permalink] New post 22 Jul 2003, 21:56
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average is (M1+M2+...+M12)/12, so we need a full sum of M1...12

(1) (M1+...+M6)=2*(M7+...+M12) - no absolute values, so it is out
(2) (M1+...+M6)/6=2.31+(M7+...+M12)/6 - no full sum either

combine: OK

Thus C
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Re: What was the average (arithmetic mean) monthly rainfall [#permalink] New post 22 Jul 2003, 22:13
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(1) Could be any two numbers X and 2X
(2) Could be any two X and X + 2.31

Need to combine the two to get the first 6 months is 4.62 EACH and the second 6 months is 2.31 EACH. This is suff.
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Re: What was the average (arithmetic mean) monthly rainfall [#permalink] New post 15 Oct 2014, 02:41
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Re: What was the average (arithmetic mean) monthly rainfall   [#permalink] 15 Oct 2014, 02:41
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