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## Homework Statement

2. Homework Equations [/B]

So the sample mean is 2. the sample variance would be [[(3-1+1)-1]/12]/36 = 8/432.

## The Attempt at a Solution

Is it, P[ (2.1-2)/sqrt(8/432) < z < (2.5-2)/sqrt(8/432)] = 0.232574.

The book answer is 0.2312. I just want to be sure.

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