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16 Oct 2005, 09:38
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The mean value of 5 numbers is 0. Are there more positive than negative values in this group of numbers?
1) The mean of positive numbers in the group is 12
2) The mean of negative numbers in the group is -6
1) The mean of positive numbers in the group is 12
2) The mean of negative numbers in the group is -6
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16 Oct 2005, 09:52
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C
A) Insuff. It can be (-12, -12, 0 , 12, 12) or (-4, -6, -14, 1,23) ...
B) Insuff. Similar to above...
If there are equal positive and negative values, |mean| of each would be same. From A and B, it can be inferred it is not the case.
if |mean of positive| > |mean of negative|
The |value per positive| is more. Which means fewer positive numbers than negative.
So from Above, the answer to the question is 'No'.
A) Insuff. It can be (-12, -12, 0 , 12, 12) or (-4, -6, -14, 1,23) ...
B) Insuff. Similar to above...
If there are equal positive and negative values, |mean| of each would be same. From A and B, it can be inferred it is not the case.
if |mean of positive| > |mean of negative|
The |value per positive| is more. Which means fewer positive numbers than negative.
So from Above, the answer to the question is 'No'.
16 Oct 2005, 10:17
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C should be the answer. but can we make a question like this one?
from the question stem and information provided, there are more negative numbers. how do we make a question subject to the information provided above?
suppose if negative numbers = 3, positive numbers = 2
suppose if negative numbers = 4, positive numbers = 1
in both of the conditions, we cannot have a mean 0.
from the question stem and information provided, there are more negative numbers. how do we make a question subject to the information provided above?
suppose if negative numbers = 3, positive numbers = 2
suppose if negative numbers = 4, positive numbers = 1
in both of the conditions, we cannot have a mean 0.
