27. The scores on a statistics test are normally distributed with a mean of 62 and a variance of 225. if the instructor wishes to assign B's or higher to the top 30 10 of the students in the class, what score is required to get a B or higher ? A. 73, 2 B. 48. 7 C . 49. 8 D. 74. 6 E. 71.5