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We have now graded using the new scale 400 copies taken randomly. The mean of these 400 copies is 9 out of 20, and the

We have now graded using the new scale 400 copies taken randomly. The mean of these 400 copies is 9 out of 20, and the standard deviation is 2. Can we say that the the mean of the test of physics-chemistry of bac S will be lower than 10? With what risk of error?

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