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Some rock samples are weighed, and their weights are determi

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GMAT Club Legend
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Some rock samples are weighed, and their weights are determi [#permalink] New post 29 Jul 2018, 04:33
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Question Stats:

83% (00:55) correct 16% (02:30) wrong based on 6 sessions
Some rock samples are weighed, and their weights are determined to be normally distributed. One standard deviation below the mean is 250 grams and one standard deviation above the mean is 420 grams.

Quantity A
Quantity B
The median weight, in grams
335 grams


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.
[Reveal] Spoiler: OA

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Re: Some rock samples are weighed, and their weights are determi [#permalink] New post 03 Aug 2018, 04:44
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From question stem we can form two eqn.

x-s = 250....i
x+s = 420....ii

Solving the two eqn for value of x we get,
x=335
In a normally distributed graph mean, median and mode are all equal

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Re: Some rock samples are weighed, and their weights are determi   [#permalink] 03 Aug 2018, 04:44
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