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Class size and grades: school administration wondered whether class size and grade achievement (in percent) were...

Class size and grades: school administration wondered whether class size and grade achievement (in percent) were related.a random sample of classes revealed the following data.

no of students 15 10 8 20 18 6
avg. grade (%) 85 90 82 80 84 92

Find y' when x=12

Math   Statistics-And-Probability   
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