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The list l consists of four integers w^2, x^2, y^2, z^2 in increasing 05 Feb 2020, 10:42
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25% (medium)

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74% (00:56) correct 26% (01:20) wrong based on 66 sessions

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The list l consists of four integers w^2, x^2, y^2, z^2 in increasing order. Which of the following list of integers must have the same standard deviation as list L?

(A) w, x, y, z

(B) w^2 - 4, x^2 - 4, y^2 - 4, z^2 ¬- 4

(C) w^4, x^4, y^4, z^4

(D) w^2/ 2, x^2/ 2, y^2/ 2, z^2/ 2

(E) 4w^2, 4x^2, 4y^2, 4z^2

Source: GMAT Quantum Math Course
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B
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The list l consists of four integers w^2, x^2, y^2, z^2 in increasing 05 Feb 2020, 21:10
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can you please explain the answer ???
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The list l consists of four integers w^2, x^2, y^2, z^2 in increasing 09 Feb 2020, 06:19
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The list l consists of four integers w^2, x^2, y^2, z^2 in increasing order. Which of the following list of integers must have the same standard deviation as list L?

(A) w, x, y, z

(B) w^2 - 4, x^2 - 4, y^2 - 4, z^2 ¬- 4

(C) w^4, x^4, y^4, z^4

(D) w^2/ 2, x^2/ 2, y^2/ 2, z^2/ 2

(E) 4w^2, 4x^2, 4y^2, 4z^2

Source: GMAT Quantum Math Course
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Since the standard deviation of a set does not change when we subtract a constant from each term in a set, w^2, x^2, y^2, z^2 has the same standard deviation as w^2 - 4, x^2 - 4, y^2 - 4, z^2 - 4.

Answer: B
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The list l consists of four integers w^2, x^2, y^2, z^2 in increasing 27 Feb 2025, 11:49
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