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The frequency distribution of student scores on a test
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23 Apr 2020, 10:24
23 Apr 2020, 10:24
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The frequency distribution of student scores on a test is as shown above. How many of the scores are above the class average?
A. 9
B. 10
C. 11
D. 12
C. 13
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Re: The frequency distribution of student scores on a test
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23 Apr 2020, 12:45
23 Apr 2020, 12:45
2
Carcass wrote:
The frequency distribution of student scores on a test is as shown above. How many of the scores are above the class average?
A. 9
B. 10
C. 11
D. 12
C. 13
Let's examine a few cases.
If it were the case that the average score is 94.5, then 1 score is greater than the average
If the average score were 93, then 3 scores are greater than the average (1 + 2 = 3)
If the average score were 89, then 6 scores are greater than the average (1 + 2 + 3 = 6)
If the average score were 84, then 8 scores are greater than the average (1 + 2 + 3 + 2 = 8)
If the average score were 80, then 12 scores are greater than the average (1 + 2 + 3 + 2 + 4 = 12)
If the average score were 78, then 16 scores are greater than the average (1 + 2 + 3 + 2 + 4 + 4 = 16)
etc..
So, the correct answer could be 1 or 3 or 6 or 8 or 12 or 16 or ...
When we check the answer choices, only one answer choice (answer choice D) is among the possible values.
Answer: D
Cheers,
Brent
Re: The frequency distribution of student scores on a test
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05 Jan 2021, 23:17
05 Jan 2021, 23:17
I noticed the bulk of the grades were at 79 and 83. I got the average of 79 and 83 which is 81. I then counted the scores that were 81 (12).
