Question: For the population of all U.S college students, the GPA is approximately normally distributed, with a mean of 2.65 and standard deviation of 0.35. Find the following:
a. The upper and lower levels of the GPA that include 2/3 of all grades (assume the upper and lower levels are equidistant above and below the mean)
b. The probability that a student has a GPA of at least a "B+" (i.e., at least 2.80)