2. What is the 90% confidence interval for the variance of exam scores for 28 algebra students, if the standard deviation of their last exam was 12.7? < 244.4 < 250.3 B) 235.4 < D) 232.4 < < 245.8 < 248.8 B) 10.4 < D) 108.6 < 2< 316.5 2 < 312.7 2< 16.4

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