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Equally spaced positive integers with a variance \sigma^2
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28 Sep 2021, 17:48
28 Sep 2021, 17:48
2
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Question Stats:
55% (00:47) correct
44% (01:21) wrong based on 18 sessions
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a, b, c, and d are equally spaced positive integers with a variance \(\sigma^2\).
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
Quantity A |
Quantity B |
Variance of the set \(\frac{a}{10}, \frac{b}{10}, \frac{c}{10}, \frac{d}{10}\) |
\(\frac{\sigma^2}{10}\) |
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
Retired Moderator
Joined: 19 Nov 2020
Posts: 326
Given Kudos: 64
GRE 1: Q160 V152
Equally spaced positive integers with a variance \sigma^2
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29 Sep 2021, 10:54
29 Sep 2021, 10:54
2
Dividing each integer by a constant will require dividing the variance by the square of this constant
Hence, Quantity is B is 10 times more than Quantity A
Answer is \(B\)
Hence, Quantity is B is 10 times more than Quantity A
Answer is \(B\)
RA911 wrote:
a, b, c, and d are equally spaced positive integers with a variance \(\sigma^2\).
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
Quantity A |
Quantity B |
Variance of the set \(\frac{a}{10}, \frac{b}{10}, \frac{c}{10}, \frac{d}{10}\) |
\(\frac{\sigma^2}{10}\) |
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
Equally spaced positive integers with a variance \sigma^2
[#permalink]
29 Sep 2021, 11:12
29 Sep 2021, 11:12
Expert Reply
RA911 wrote:
a, b, c, and d are equally spaced positive integers with a variance \(\sigma^2\).
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
Quantity A |
Quantity B |
Variance of the set \(\frac{a}{10}, \frac{b}{10}, \frac{c}{10}, \frac{d}{10}\) |
\(\frac{\sigma^2}{10}\) |
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
is the variance some sort of SD ?/ and is it tested on the GRE?
I have never seen a question in my entire life on the GRE with the word variance tested. Neither in the PP Plus.......
Just asking
