? We obtained 12 results: 275; 273; 279; 267; 276; 272; 271; 269; 270; 265; 268; 277. Assuming the results are obtained for a random variable $X_i \sim N(\mu, \sigma^2)$ with \mu unknown find for \mu the confidence interval at the confidence level 0.9. $X_i$ are independent & have the same distribution.
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