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Statistic Problem:Suppose the 47 students in my 9:00 Math 80 class

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Intern
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Joined: 06 Sep 2018
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Statistic Problem:Suppose the 47 students in my 9:00 Math 80 class  [#permalink]

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New post 06 Sep 2018, 14:59
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Suppose the 47 students in my 9:00 Math 80 class earned a mean score of 80% on Exam 1 while my 10:00 class earned a mean of 76% . If the mean score for the two classes combined is 78.35% how many students are in my 10:00 class?

Please help me I tried every formula
Intern
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Joined: 29 Aug 2018
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Re: Statistic Problem:Suppose the 47 students in my 9:00 Math 80 class  [#permalink]

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New post 06 Sep 2018, 19:30
Use allegation:
Class 9 10
80% 76%
78.35%
2.35 1.65
Taking the ratio will give 47/33
So 33 students in class 10.
Re: Statistic Problem:Suppose the 47 students in my 9:00 Math 80 class &nbs [#permalink] 06 Sep 2018, 19:30
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Statistic Problem:Suppose the 47 students in my 9:00 Math 80 class

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