4. The following data summarize the attendance records for a class of mathematics students. [3, 1, 1, 3]
Classes Missed | Number of Students
---|---
1-3 | 7
4-6 | 12
7-9 | 5
10-12 | 3
13-15 | 2
a) Calculate the (estimated) mean number of classes missed by students in this course.
b) What is the median interval for the number of classes missed.
c) What is the modal interval (mode) for the numbers of classes missed?
d) Draw a frequency histogram and frequency polygon for the data.