129. According to a hospital administrator , historical records over the past 10 years have shown that 20%% Of the major surgery patients are dissatisfied with after - surgery care in the hospital . A scientific poll based on 400 hospital patients has just been conducted . Sixty - four ( 64 ) patients indicated that they were dissatisfied with the after surgery care . What are the mean and the standard deviation of the sampling distribution of'*' ? A. 16%! and. 03 49'0 B. 20%9 and 1. 83% C. 20%6 and 20 0 D. 20%'0 and. 0349/0 E. 20%'0 and 16%/0