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The grade point averages for 10 randomly selected high school students are listed below. Assume the grade point averages are normally distributed.

2.0 , 3.2 , 1.8 , 2.9 , 0.9 , 4.0 , 3.3 , 2.9 , 3.6 , 0.8

Find a 98% confidence interval for the true mean.

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