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The length of a human pregnancy is approximately normally distributed with mean LaTeX: \muμ=266 days and...

The length of a human pregnancy is approximately normally distributed with mean LaTeX: \muμ=266 days and standard deviation LaTeX: \sigmaσ=16 days. A random sample of 36 pregnancies is obtained. What is LaTeX: \sigma_{x-bar}σ x − b a r? Choose the best answer. Group of answer choices 1.57 36 .44 2.67

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