A college's data about incoming freshmen indicates that the mean of their high school GPA was 3.4, with a standard deviation of 0.35. Let X=the GPA of an incoming freshman. The students are randomly assigned to writing groups of size 49.
a. Find P( xbar ≥ 3.5)
b. For P(xbar ≤ k)=0.80 find k, ie find the 80th Percentile.