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What was Bill's average (arithmetic mean) grade for all of his courses

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adkikani
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What was Bill's average (arithmetic mean) grade for all of his courses [#permalink] New post   20 Nov 2018, 09:12
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What was Bill's average (arithmetic mean) grade for all of his courses?

(1) His grade in social studies was 75, and his grade in science was 75.

(2) His grade in mathematics was 95.
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DavidTutorexamPAL
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Re: What was Bill's average (arithmetic mean) grade for all of his courses [#permalink] New post   20 Nov 2018, 09:38
As currently written, the answer is E.
We have no way of knowing how many courses Bill takes - if there are others besides social studies, mathematics and science, we have no data on them.
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adityaschauhan
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Re: What was Bill's average (arithmetic mean) grade for all of his courses [#permalink] New post   21 Nov 2018, 00:49
Quote:

What was Bill's average (arithmetic mean) grade for all of his courses?


(1) His grade in social studies was 75, and his grade in science was 75.

(2) His grade in mathematics was 95.



Mean = Sum of all courses(S)/ total number of courses(N)
we don't have any information about Total number of courses, So (E).
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Re: What was Bill's average (arithmetic mean) grade for all of his courses [#permalink] New post   21 Nov 2018, 10:17
DavidTutorexamPAL wrote:
As currently written, the answer is E.
We have no way of knowing how many courses Bill takes - if there are others besides social studies, mathematics and science, we have no data on them.



why DavidTutorexamPAL do you assume that there are other courses as well ? it is nowhere mentioned :)
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DavidTutorexamPAL
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Re: What was Bill's average (arithmetic mean) grade for all of his courses [#permalink] New post   21 Nov 2018, 10:23
dave13 wrote:
DavidTutorexamPAL wrote:
As currently written, the answer is E.
We have no way of knowing how many courses Bill takes - if there are others besides social studies, mathematics and science, we have no data on them.



why DavidTutorexamPAL do you assume that there are other courses as well ? it is nowhere mentioned :)
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it's exactly the other way around - I don't assume there are more, I just don't assume there definitely aren't more. AS long as we don't for sure that these are all the courses, we have no way of answering
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Re: What was Bill's average (arithmetic mean) grade for all of his courses [#permalink] New post   24 Feb 2022, 11:31
adkikani wrote:

Project DS Butler: Day 15: Data Sufficiency (DS29)


For DS butler Questions Click Here


What was Bill's average (arithmetic mean) grade for all of his courses?


(1) His grade in social studies was 75, and his grade in science was 75.

(2) His grade in mathematics was 95.


In order to determine Bill's average (Arithmetic mean) grade for all of his courses we must know the total number of courses that Bill was enrolled in and his score in each of those courses. Clearly, neither statement gives us this information, and even together, the two statements would be insufficient in determining the average grade for all the courses.

Hence, E.
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Re: What was Bill's average (arithmetic mean) grade for all of his courses [#permalink] New post   01 Mar 2023, 17:50
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Re: What was Bill's average (arithmetic mean) grade for all of his courses [#permalink]
01 Mar 2023, 17:50
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