The scores and their percent of the final grade for a statistics student are given. What is the student's weighted mean score? The student's weighted mean score is 89.89. (Simplify your answer. Round to two decimal places as needed.) Score Percent of final grade Homework 81 Quiz 88 Quiz 91 Project 98 Final Exam 88 25555 20 35 35 Use a stem-and-leaf plot to display the data, which represent the scores of a biology class on a midterm exam. Describe any patterns. 75 85 90 80 87 81 92 94 68 75 78 650 66 888 82 88 95 91 98 87 56 91 74 80 76 91 85 79 Determine the leaves in the stem-and-leaf plot below. Key: 3|3=33 Exam Scores ... 68 74,5,5,6,9 80,1,2,5,5,7,7,8 0,1,1,1,2,4,5,8 What best describes the data? O O A. The scores are evenly spread from the 60s to the 90s. B. Most of the scores are in the 70s and 80s. C. Most of the scores are in the 60s and 70s. D. Most of the scores are in the 80s and 90s.