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The arithmetic mean of a data set is 46 and the standard deviation of the set is 4. Which of the following contains the

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by BTGModeratorVI » Wed Jan 06, 2021 8:08 am

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Answers

A

B

C

D

E

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Difficulty—

The arithmetic mean of a data set is 46 and the standard deviation of the set is 4. Which of the following contains the interval two standard deviations from the mean of the set?

(A) 38 to 46
(B) 38 to 54
(C) 42 to 50
(D) 44 to 48
(E) 46 to 50

Answer: B
Source: Princeton Review
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Re: The arithmetic mean of a data set is 46 and the standard deviation of the set is 4. Which of the following contains

by Brent@GMATPrepNow » Thu Jan 14, 2021 7:22 am
BTGModeratorVI wrote: ↑
Wed Jan 06, 2021 8:08 am
 The arithmetic mean of a data set is 46 and the standard deviation of the set is 4. Which of the following contains the interval two standard deviations from the mean of the set?

(A) 38 to 46
(B) 38 to 54
(C) 42 to 50
(D) 44 to 48
(E) 46 to 50

Answer: B
Source: Princeton Review
-----------ASIDE-----------------
A little extra background on standard deviations above and below the mean

If, for example, a set has a standard deviation of 4, then:
1 standard deviation = 4
2 standard deviations = 8
3 standard deviations = 12
1.5 standard deviations = 6
0.25 standard deviations = 1
etc


So, if the mean of a set is 9, and the standard deviation is 4, then:
2 standard deviations ABOVE the mean = 17 [since 9 + 2(4) = 17]
1.5 standard deviations BELOW the mean = 3 [since 9 - 1.5(4) = 3]
3 standard deviations ABOVE the mean = 21 [since 9 + 3(4) = 21]
etc.
----------------------------------

The arithmetic mean of a data set is 46 and the standard deviation of the set is 4. Which of the following contains the interval two standard deviations from the mean of the set?

2 standard deviations ABOVE the mean = 46 + 2(4) = 54
2 standard deviations BELOW the mean = 46 - 2(4) = 38

The range = 38 to 54

Answer: B

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
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Re: The arithmetic mean of a data set is 46 and the standard deviation of the set is 4. Which of the following contains

by Scott@TargetTestPrep » Fri Jan 15, 2021 10:14 am
BTGModeratorVI wrote: ↑
Wed Jan 06, 2021 8:08 am
 The arithmetic mean of a data set is 46 and the standard deviation of the set is 4. Which of the following contains the interval two standard deviations from the mean of the set?

(A) 38 to 46
(B) 38 to 54
(C) 42 to 50
(D) 44 to 48
(E) 46 to 50

Answer: B
Solution:

Two standard deviations above the mean is 46 + 2(4) = 46 + 8 = 54.

Two standard deviations below the mean is 46 - 2(4) = 46 - 8 = 38.

Answer: B

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