Let "X=" the average exam score: "X\\sim N(\\mu,\\sigma^2)"
a) What is the expected value of the average exam score of the 20 students in your lab section?
b) What is the standard deviation of the distribution of the average exam score of the 20 students in your lab section?
c) What is the probability that the average score of a random sample of 20 students exceeds 59.5?
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