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Aaron’s first three quiz scores were 75, 84, and 82. If his
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29 Aug 2018, 16:26
29 Aug 2018, 16:26
Expert Reply
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Question Stats:
97% (00:54) correct
2% (00:54) wrong based on 44 sessions
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Aaron’s first three quiz scores were 75, 84, and 82. If his score on the fourth quiz reduced his average (arithmetic mean) quiz score to 74, what was his score on the fourth quiz?
Show: :: OA
55
Re: Aaron’s first three quiz scores were 75, 84, and 82. If his
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31 Aug 2018, 22:05
31 Aug 2018, 22:05
1
Answer is 55.
Since the sum of the first three is 241
Thus
241+x/3 = 74
which gives x=55
Since the sum of the first three is 241
Thus
241+x/3 = 74
which gives x=55
Re: Aaron’s first three quiz scores were 75, 84, and 82. If his
[#permalink]
19 Dec 2020, 12:41
19 Dec 2020, 12:41
1
Average for the first three tests is = ( 75 + 84 + 82) / 3 = 241/3 = 80.33
average reduced = 80.33 - 74 = 6.33
Number for fourth test = 80.33 - 6.33 X 4 = 80.33 - 25.33= 55
average reduced = 80.33 - 74 = 6.33
Number for fourth test = 80.33 - 6.33 X 4 = 80.33 - 25.33= 55
