According to the 2015 Physician Compensation Report by Medscape (a subsidiary of WebMD), American orthopedists earned an average of $421,000 in 2014. Suppose that the mean and standard deviation of the 2014 earnings of all American orthopedists are $421,000 and $90,000, respectively. Let & be the mean earnings of a random sample of 200 American orthopedists. Find the mean and standard deviation of the sampling distribution of x