Miguel states that he is 92% confident that the true population mean weight of a man's heart is between 280g and 295g. What is Miguel's point estimate? Standard deviation = 15g Level of significance = 92% Mu = 280g, 295g Mu = 92% of 280g = 257.6g alpha = 0.08 x-bar = 280g x-bar = 287.5g Standard deviation = 575g x-bar = 575g Mu = 575g