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The standard deviation of the SAT scores of the randomly selected 21 students is 9. Assume the distribution of the all scores is normal

The standard deviation of the SAT scores of the randomly selected 21 students is 9. Assume the distribution of the all scores is normal and calculate a 90% confidence interval for (51.57 149.294) (5.73 - 16.58) (6.01-12.53) (45.66-128.27)

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