|GRE Data Analysis (Select One)
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|Author:||questioner [ Mon May 07, 2012 8:44 pm ]|
|Post subject:||GRE Data Analysis (Select One)|
The chart above shows the distribution of letter grades for three groups of students on one test. Point values are assigned to the letter grades so that A = 4 points, B = 3 points, C = 2 points and D = 1 point. Which of the following values is the closest to the average (arithmetic mean) grade of students in the group 3?
(B) There are 4 + 7 + 9 + 2 = 22 students in the group 3.
The grade distribution in the group 3 was:
4 students received D;
7 students received C;
9 students received B;
2 students received A.
Therefore, the sum of the grade points for the group 3 is:
(4 × 1) + (7 × 2) + (9 × 3) + (2 × 4) = 4 + 14 + 27 + 8 = 53.
We can find the average grade in gr the group 3 by dividing this sum by the number of students in the group 3:
Average for the group 3 = 53/22.
Performing the required division, we see that 2.4 is the closest answer choice.
The correct answer is choice (B).
I did not understand the question, could you please elaborate. Which groups are we talking about?
|Author:||Gennadiy [ Mon May 07, 2012 8:46 pm ]|
|Post subject:||Re: t.4, qt.6: data analysis, arithmetic mean|
did not understand the question could u please elaborate. which groups are we talking about?We have three groups of students given by the chart:
Each group is presented by its color. For example, all the green bars represent the group #2:
The first (from left) green bar tells us that 5 students in the group #2 have received a "D" mark on the test:
The rest of the bars can be interpreted similarly.
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