d. What is these lead levels' interquartile range? 6. Here a stem-and-leaf display for course grades of an algebra class: 0 | 79 1 3 2 4 5 |38 6 3679 " '7 | 0' means 70 7 |001389 8 | 03466789 9 | 011257 a. How many students earned Bs (course grades from 80 to 89)? b. Which value is greater: the mean or the median? How do you know? c. How many students would you estimate stopped participating in the class during the quarter? In the plot, what are their course grades called? 7. Scyrine and Alexandra are basketball players. The team statistician recorded the points each had scored in their first 20 games of the season, computed the five-number summaries, and made box plots for both players. Scyrine Alexandria min 6 10 Q1 11 13 median 17 17 Q3 24 18 max 27 23