A group of 20 values has a mean of 67 and a median of 70. A different group of 30 values has a mean of 82 and a median of 79. (a)What is the mean of the 50 values? (b)What is the median of the 50 value? Question 9 options: Mean cannot be determined, median is 73 Mean is 76, median cannot be determined Mean is 76, median is 77 Mean is 74.5, median is 74.5 Mean and median cannot be determined