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08 Jul 2006, 00:11
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How many sets containing 10 positive digits (integers from 1 to 9) have a single mode of 9 and a mean of no more than 4.5?
(A) 3 (B) 4 (C) 5 (D) 6 (E) more than 6
(A) 3 (B) 4 (C) 5 (D) 6 (E) more than 6
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08 Jul 2006, 00:34
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I don't know if I have understood the question or not.
What I understand is sets can contain only one value of 9 and 9 other value. Mean should not greater than 4.5.
If this is asked then I think E.
Set could be (9,Nine 1s), (9,2,Eight 1s), (9,2,3,Seven 1s) etc.....
So it will be more than 6.
What I understand is sets can contain only one value of 9 and 9 other value. Mean should not greater than 4.5.
If this is asked then I think E.
Set could be (9,Nine 1s), (9,2,Eight 1s), (9,2,3,Seven 1s) etc.....
So it will be more than 6.
08 Jul 2006, 00:45
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A set has a single mode of 9 only if 9 occurs more often than any other number. Some sets have several modes, others have no mode.
