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23 Jun 2022, 13:30
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Difficulty:
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Question Stats:
81% (01:36) correct
19%
(01:37)
wrong
based on 138
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The earthworms in Sample A have an average length of 2.4 inches, and the earthworms in Sample B have an average length of 3.8 inches. The average length of the earthworms in both samples is 3.0 inches. Which of the following must be true?
I. There are more earthworms in Sample A than in Sample B.
II. The median length of the earthworms is 3.2 inches.
III. The range of lengths of the earthworms is 1.4.
A. I only
B. II only
C. III only
D. I and II only
E. II and III only
I. There are more earthworms in Sample A than in Sample B.
II. The median length of the earthworms is 3.2 inches.
III. The range of lengths of the earthworms is 1.4.
A. I only
B. II only
C. III only
D. I and II only
E. II and III only
23 Jun 2022, 13:40
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Beautiful question where you need to be aware about the basic in GMAT statistics questions and theory.
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471665CE-852C-4AF3-8F14-09EB798A6E0D.jpeg [ 382.69 KiB | Viewed 6013 times ]
23 Jun 2022, 16:46
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Considering that X is the number of earthworms in Sample A and that Y is the number of earthworms in Sample B:
(2.4 * X + 3.8*Y) / X+Y = 3
2.4X + 3.8Y= 3X + 3Y
0.6X = 0.8Y
I)Correct, the number X must be greater than Y
II)We do not know the length of each earthworm to calculate the median, false
III)Same reason as before, false
Answer A
Posted from my mobile device
(2.4 * X + 3.8*Y) / X+Y = 3
2.4X + 3.8Y= 3X + 3Y
0.6X = 0.8Y
I)Correct, the number X must be greater than Y
II)We do not know the length of each earthworm to calculate the median, false
III)Same reason as before, false
Answer A
Posted from my mobile device
