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On the most recent test in stats class, Jamal scored x point
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09 Dec 2017, 18:41
09 Dec 2017, 18:41
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96% (01:08) correct
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On the most recent test in stats class, Jamal scored x points and Raya scored 73 points. If the average of Cliff and Raya’s scores is 79 points, and the average of Jamal and Cliff’s scores is 89, then x =
Drill 2
Question: 12
Page: 530
Question: 12
Page: 530
Show: :: OA
93
Re: On the most recent test in stats class, Jamal scored x point
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29 Dec 2017, 15:32
29 Dec 2017, 15:32
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Explanation
Use the Average Pie. Consider Cliff and Raya’s average first: There are 2 of them, and their average is 79, so multiply 2 × 79 to get their total of 158. Call Cliff’s score c, and c + 73 = 158, so c = 85.
Now repeat the process with Jamal and Cliff’s average: 2 people with an average of 89, so 2 × 89 = 178 total points. Therefore, x + 85 = 178, and x is 93.
Use the Average Pie. Consider Cliff and Raya’s average first: There are 2 of them, and their average is 79, so multiply 2 × 79 to get their total of 158. Call Cliff’s score c, and c + 73 = 158, so c = 85.
Now repeat the process with Jamal and Cliff’s average: 2 people with an average of 89, so 2 × 89 = 178 total points. Therefore, x + 85 = 178, and x is 93.
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Re: On the most recent test in stats class, Jamal scored x point
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15 Feb 2019, 17:36
15 Feb 2019, 17:36
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sandy wrote:
On the most recent test in stats class, Jamal scored x points and Raya scored 73 points. If the average of Cliff and Raya’s scores is 79 points, and the average of Jamal and Cliff’s scores is 89, then x =
Drill 2
Question: 12
Page: 530
Question: 12
Page: 530
Show: :: OA
93
Letting c = Cliff’s score, we can create the equation:
(c + 73)/2 = 79
c + 73 = 158
c = 85
Since the average of Cliff and Jamal’s scores is 89:
(x + 85)/2 = 89
x + 85 = 178
x = 93
