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1) DS:Is the standard deviation of the salaries of Company Y

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Manager
Joined: 08 Apr 2004
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1) DS:Is the standard deviation of the salaries of Company Y [#permalink]

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24 Aug 2004, 22:11
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1) DS:Is the standard deviation of the salaries of Company Yâ€™s employees greater than the standard deviation of the salaries of Company Zâ€™s employees?
(1)The average (arithmetic mean) salary of Company Yâ€™s employees is greater than the average salary of Company Zâ€™s employees.
(2)The median salary of Company Yâ€™s employees is greater than the median salary of Company Zâ€™s employees.

2) DS:What is the value of v3 â€“ k3?
(1) v k > 0
(2) v â€“ k = 6
Senior Manager
Joined: 22 Jun 2004
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24 Aug 2004, 22:47
My answers are (1) E and (2)E.

As for (1), neither the average nor the median gives any picture of deviations. Thus, both are insufficient. Thus E

In (2), I presume v^3 - k^3 is to be determined(cubed v - cubed k).

But v^3 - k^3 = (v-k) (v^2+vk+k^2)

Neither (1) nor (2) can give us the value. Both together also cannot give us any value. Thus E.

marine wrote:
1) DS:Is the standard deviation of the salaries of Company Yâ€™s employees greater than the standard deviation of the salaries of Company Zâ€™s employees?
(1)The average (arithmetic mean) salary of Company Yâ€™s employees is greater than the average salary of Company Zâ€™s employees.
(2)The median salary of Company Yâ€™s employees is greater than the median salary of Company Zâ€™s employees.

2) DS:What is the value of v3 â€“ k3?
(1) v k > 0
(2) v â€“ k = 6

_________________

Awaiting response,

Thnx & Rgds,
Chandra

Re: DS: Std Dev   [#permalink] 24 Aug 2004, 22:47
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