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Re: On the most recent test in stats class, Jamal scored x point
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29 Dec 2017, 15:32
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.