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Camille's average on her 6 math tests this marking period is
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19 May 2017, 02:15
19 May 2017, 02:15
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Question Stats:
93% (01:01) correct
6% (01:20) wrong based on 82 sessions
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Camille's average on her 6 math tests this marking period is 75. Fortunately for Camille, her teacher drops each student's lowest grade, and this raises her average to 85.What was her lowest grade?
A) 20
B) 25
C) 30
D) 40
E) 50
Re: Camille's average on her 6 math tests this marking period is
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22 Sep 2017, 06:05
22 Sep 2017, 06:05
Since the mean of 6 grades is 75, the sum of this grade is equal to 6*75 = 450. Then, we can check the answers by subtracting them from 450 and dividing by 5, the number of remaining grades. Since the answers are in increasing order we should start by answer C to have an idea of the direction in which we should move.
Using C, we would get (450-30)/5 = 84, too low. This means that we are subtracting a too high grade. Then, we should move up. Let's try with B.
Using B, we obtain (450-25)/5 = 85. Here we are. Answer B is the right one!
Using C, we would get (450-30)/5 = 84, too low. This means that we are subtracting a too high grade. Then, we should move up. Let's try with B.
Using B, we obtain (450-25)/5 = 85. Here we are. Answer B is the right one!
Re: Camille's average on her 6 math tests this marking period is
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29 Sep 2017, 06:49
29 Sep 2017, 06:49
1
avg=sum/no
6*75=450
after lowest grade dropped
5*85=425
450-425=25
answer B
6*75=450
after lowest grade dropped
5*85=425
450-425=25
answer B
