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Sagot :
Sometimes, the strategy guess and check is the simplest. 82, 75, 78, and 80.
i) Let's try 80. All added together is 395 divided by 5 is 79%, which isn't enough. Now trying 85, the mean would be 80%.
ii) Let's try 90's mean. It's 81%.
iii) First, I'm going to try 95. The percentage mean is 82%
I didn't have to guess for ii) and iii) since I saw a pattern happening.
i) Let's try 80. All added together is 395 divided by 5 is 79%, which isn't enough. Now trying 85, the mean would be 80%.
ii) Let's try 90's mean. It's 81%.
iii) First, I'm going to try 95. The percentage mean is 82%
I didn't have to guess for ii) and iii) since I saw a pattern happening.
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