Forty one percent of primary care doctors think their pabients receive unnecessary medical care. If required, round your answer to four decimal places. (a) Suppose a sample of 300 primary care doctors was taken. Calculate the mean and vandad deviation of the sample proporton of doctors who think their patiens receive unnecescary medical care. npn(te)=ip)=ep (b) Suppose a umple of soo primary care doctors was taken. Calculate the mean and standard devation of the sample proportion of doctars who think their patients feceive unnecessary inedical cart 4=