The scores of 12th-grade students on the National Assessment of Educational Progress year 2000 mathematics test have a distribution that is approximately Normal with mean μ = 321 and standard deviation σ = 32. 1) Choose one 12th-grader at random. What is the probability (±0.1) that his or her score is higher than 321 2) Higher than 385 (±0.001)? 3) Now choose an SRS of 16 twelfth-graders and calculate their mean score x⎯⎯⎯x. If you did this many times, what would be the mean of all the x⎯⎯⎯x-values?