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D. Weekday. umbers 15-16 Given the following Stem-and-Leaf Display of the grade averages of a class of Grade 7 students, find the Wednesday ng information Leaf Stem 7 6,6,7,8,9 8 0,1,2,2,3,5,5,5,6,7,8,8,9 9 1,1,3,3,4,5,5 15. How many students are there in the G7-class? A. 20 B. 25 C. 30 D. 40 16. What is the lowest and highest grade average in the class, respectively? A. 76 and 79 B. 80 and 89 C. 91 and 95 D. 76 and 95 7. The number of times an observation or a particular value appears in a data set. A. Multiplication B. Data C. Frequency D. Statistics 3. A table that shows the frequencies for the categories, values of a counting variable or class intervals. A. statistics B. data C. Frequency D. frequency distribution . In a class interval, the middle score is called the A. class size B. class mark. C. lower class limit D. upper class limit.​