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Some rock samples are weighed, and their weights are determi

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sandy
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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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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.
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C
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amorphous
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Re: Some rock samples are weighed, and their weights are determi [#permalink] New post   03 Aug 2018, 04:44
4
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] New post   19 Aug 2022, 04:01
Hello from the GRE Prep Club BumpBot!

Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Some rock samples are weighed, and their weights are determi [#permalink]
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