A marketing class of 50 students evaluated the instructor using the following scale: superior, good, average, poor, and inferior. The descriptive summary showed the following survey results: 2% superior, 8% good, 45% average, 45% poor, and 0% inferior () A. The instructor's performance was great! B.The instructor's performance was inferior C.Most students rated the instructor as poor or average D.No conclusions can be made The sample variance of hourly wages was What is the sample standard deviation? () A.$1.96 B.$4.67 C.$3.16 D.$10.00