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The standard deviation of grades on the English exam.
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03 Nov 2020, 11:37
03 Nov 2020, 11:37
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Question Stats:
75% (00:38) correct
24% (00:43) wrong based on 45 sessions
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Quantity A |
Quantity B |
The standard deviation of grades on the English exam |
The standard deviation of grades on the Spanish exam |
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.
Source: 320 GRE Math Questions
Re: The standard deviation of grades on the English exam.
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03 Nov 2020, 18:22
03 Nov 2020, 18:22
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Standard deviation is the average distance of data points from the mean. Since all the values (and therefore the mean) are 90, the standard deviation is 0. The standard deviation of the Spanish test scores are clearly not 0, since there are multiple scores. Therefore, Quantity A is greater.
Re: The standard deviation of grades on the English exam.
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09 Nov 2020, 01:20
09 Nov 2020, 01:20
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in the case of English, it is clear that there is no deviation, so std= 0
on the other hand, six students get six different numbers, so there must be a deviation. And std cannot be negative.
therefore, B is greater than A.
B should be the right answer.
on the other hand, six students get six different numbers, so there must be a deviation. And std cannot be negative.
therefore, B is greater than A.
B should be the right answer.
