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mean

Expert replies
by g.shankaran » Thu Jun 09, 2011 8:06 am
if m is a positive odd integer, what is the average ( arithmetic mean) of a certain set of m integers?

1. the integer in the set are consecutive multiples of 3.
2. the median of the set of integers is 33.
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Source: — Data Sufficiency |

by cans » Thu Jun 09, 2011 8:11 am
mean of m integers (m is odd)
a) if numbers are like 3,6,9 mean = 6
if numbers are 6,9,12, mean=9
insufficient
b) median is 33
numbers can be 1,33,1000
or 2,33,10
insufficient
a&b) median is 33. in consecutive multiples of 3, median=mean (as number of integers is odd)
Thus mean=33
IMO C
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Cans!!
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by bubbliiiiiiii » Thu Jun 09, 2011 8:13 am
+1 for C.
Regards,

Pranay
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by siddhans » Mon Jul 11, 2011 3:39 am
Is my approach right?
Lets says the numbers are 30 , 33 , 36 then the median is 33 but the mean = 33

if the numbers are 27 , 30 , 33,36, 39 the median is 33 but the mean is 33.. There can be any number of odd positive numbers in the set M ....
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