Suppose your statistics instructor gave six examinations during the semester. You received the following grades (percent correct): 80, 74, 90, 93, 94, and 73. Instead of averaging the six scores, the instructor indicated he would randomly select two grades and compute the final percent correct based on the two percents.
1) How many different samples, without replacement, of two test grades are possible?
2) Computer the mean of the sample and compute the population mean
3) Both means are equal/not equal?