Starter – online 9x9 starter
Chapter 32
Statistical measures
32.8 Grouped data
Learning objectives:
• to distinguish between grouped discrete and
• to find the estimate of the mean for grouped
Success criteria:
• I can calculate the estimate of the mean for
grouped discrete and continuous data
• I can identify the modal class from a
grouped frequency distribution
1) What is the modal class?
2) How many people scored
more than 50?
3) What is the estimate of
the mean?
e.g. 40 students were asked how long it takes
them to get home after school
1) What is the modal class?
2) What is the estimate of
the mean?
Time taken to get home after school
Classwork:
Strategies if you get stuck:
EX 31H:
1 – c, d
2, 4, 7
*Challenge:
EX 31H:
8, 9, 10
• research (notebook, textbook, internet)
• ask your classmates or the teacher
Mark your answers according to the mark scheme if
possible,
compare your answers with your classmates