The grade point averages for 10 randomlly selected high school students are listed below. Assume the grade point averages are normally distributed. Find a 98% confidence interval for the true mean.
2.0 , 3.2 , 1.8 , 2.9 , 0.9 , 4.0 , 3.3 , 2.9 , 3.6 , 0.8
Please show all work and make answer bold.