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Re: Set A {300,400,500,700,900} Set B {100,200,300,500,900} [#permalink]
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Answer: B
In the informal way of standard deviation, we just compare different elements difference from the mean in each set.
A: Mean equals (300+400+500+700+900)/ 5 = 2800/5 = 560
Difference from mean for each element:
260, 160, 60, 140, 440

B: Mean equals (100+200+300+500+900)/5= 2000/5=400
Difference from mean for each element:
300, 200, 100, 100, 500

We see in B numbers in the set differ more from the difference of A’s numbers from the mean in A. So B’s standard deviation is more than A’s. The answer is B.
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Re: Set A {300,400,500,700,900} Set B {100,200,300,500,900} [#permalink]
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Arun1992 wrote:
Set A {300,400,500,700,900}
Set B {100,200,300,500,900}

Quantity A
Quantity B
Standard deviation of Set A
Standard deviation of Set B


A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given


The answer options include only B. A bug in the system perhaps :roll:
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Re: Set A {300,400,500,700,900} Set B {100,200,300,500,900} [#permalink]
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AKLIANOS wrote:
Arun1992 wrote:
Set A {300,400,500,700,900}
Set B {100,200,300,500,900}

Quantity A
Quantity B
Standard deviation of Set A
Standard deviation of Set B


A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given


The answer options include only B. A bug in the system perhaps :roll:


No. We do not have bugs in the code. We are perfect :lol:

The user did not set properly the timer when he created the question

Thank you

Regards
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Re: Set A {300,400,500,700,900} Set B {100,200,300,500,900} [#permalink]
Carcass wrote:
AKLIANOS wrote:
Arun1992 wrote:
Set A {300,400,500,700,900}
Set B {100,200,300,500,900}

Quantity A
Quantity B
Standard deviation of Set A
Standard deviation of Set B


A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given


The answer options include only B. A bug in the system perhaps :roll:


No. We do not have bugs in the code. We are perfect :lol:

The user did not set properly the timer when he created the question

Thank you

Regards


Meant no offence.
Just pointing out what I noticed :wink:
It is a good question to be spoiled from the beginning.
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Re: Set A {300,400,500,700,900} Set B {100,200,300,500,900} [#permalink]
1
Good question. But in the real GRE they give harder questions on standard deviation not just finding Standard deviation. Just saying. Thanks!
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Re: Set A {300,400,500,700,900} Set B {100,200,300,500,900} [#permalink]
1
In both series, the difference between sequential numbers is 100 by 900s. In first series it is 200, and 400 in the second. That gives the hint that series B is most likely of the greater SD. In case time is running out, that technique might come in handy!
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Re: Set A {300,400,500,700,900} Set B {100,200,300,500,900} [#permalink]
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