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X is a set containing 7 different numbers. Y is a set containing 6 dif

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X is a set containing 7 different numbers. Y is the set containing 6  [#permalink]

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New post 05 Jul 2017, 08:57
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X is a set containing 7 different numbers. Y is the set containing 6 different positive numbers all of which are members of set X. Is the mean of X equal to the mean of Y?

a) Range of X is greater than range of Y
b) Sum of all the numbers in set X< Sum of all the numbers in set Y

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X is a set containing 7 different numbers. Y is a set containing 6 dif  [#permalink]

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New post 05 Jul 2017, 09:36
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anurag16 wrote:
X is a set containing 7 different numbers. Y is the set containing 6 different positive numbers all of which are members of set X. Is the mean of X equal to the mean of Y?

a) Range of X is greater than range of Y
b) Sum of all the numbers in set X< Sum of all the numbers in set Y



Hi..
If all 7 numbers are different and 6 of them have a certain MEAN, M..
This would be EQUAL to mean of 7 numbers ONLY when 7th number itself is EQUAL to M
...

Let's see the statements...

a) Range of X is greater than range of Y
This means the 7th number is either greater than or less than the 6 numbers in set Y..
So the 7 number cannot be EQUAL to mean of 6 numbers..
Ans is NO

Sufficient

b) Sum of all the numbers in set X< Sum of all the numbers in set Y
Clearly a lower number /7 will be less than greater number/6..
Clearly mean of Y>mean of X..
Ans is again NO

Sufficient

D
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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


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X is a set containing 7 different numbers. Y is a set containing 6 dif  [#permalink]

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New post 30 Sep 2017, 20:25
X is a set containing 7 different numbers. Y is a set containing 6 different positive numbers, all of which are members of set X. Is the mean of X equal to the mean of Y ?

A. Range of X is greater than range of Y.

B. (Sum of all the numbers in set X) < (Sum of all numbers in set Y).
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Re: X is a set containing 7 different numbers. Y is a set containing 6 dif  [#permalink]

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New post 30 Sep 2017, 21:26
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Kamlesh44 wrote:
X is a set containing 7 different numbers. Y is a set containing 6 different positive numbers, all of which are members of set X. Is the mean of X equal to the mean of Y ?

A. Range of X is greater than range of Y.

B. (Sum of all the numbers in set X) < (Sum of all numbers in set Y).


Pl search before posting a new Q.
refer to discussion above
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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


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Re: X is a set containing 7 different numbers. Y is a set containing 6 dif  [#permalink]

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New post 26 Nov 2018, 05:15
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Re: X is a set containing 7 different numbers. Y is a set containing 6 dif &nbs [#permalink] 26 Nov 2018, 05:15
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