Do you know the formula to determine the answer

X Biased and unbiased estimators Serge was curious if a sample third quartile (or Q3) was an unbiased estimator of a population third quartile. He started with a large normally distributed population of test scores whose third quartile was Q3 = 80 points. He then took a random sample of 6 tests and calculated the third quartile of the sample. He replaced those tests and repeated this process for a total of 40 trials. His results are summarized in the dotplot below, where each dot represents the third quartile from a sample of 6 tests. .. . . . .. . . .. ... . . . 70 74 78 82 86 90 Do 4 problems O o o o Check