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Median Cons. Integer

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Source: — Data Sufficiency |
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by rijul007 » Wed Jan 04, 2012 9:55 pm
karthikpandian19 wrote:Is the mean of set S greater than its median?
(1) All members of S are consecutive multiples of 3
(2) The sum of all members of S equals 75

(1) All members of S are consecutive multiples of 3

Case1:When no of elements is odd
3,6,9
Arithematic mean = 6
Median = 6

Case2: When number of elements is even

3,6,9,12
Arithematic mean = 7.5
Median(for even multiples) = Arithematic mean of the two middle terms = 6+9/2 = 7.5

Answers the question with a NO

Sufficient

(2) The sum of all members of S equals 75
Tells us nothing, about the mean and median of set S

Insufficient

Option A
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by karthikpandian19 » Thu Jan 05, 2012 9:05 pm
OA is A
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