2.  Frequency is the number of times you get an answer
This Column Means:
How often they do homework
Frequency is the number of times you get an answer 
How many people are in this ‘class’
How fast they do the homework 1

3. How Many students do up to 150 hours p.a? 15 10 5 2

4. A student who does exactly 500 hours p.a. is..
In this class
In this class 3

5.  The cumulative column ‘accumulates’ (adds up) the number of answers
Number of people in the survey: 35 
The cumulative column ‘accumulates’ (adds up) the number of answers
200
Unknown 4

6.  Always Plot on the UPPPER LIMIT The first Point will be plotted at:
0 (hours), 5 (frequency)
25 (hours), 5 (frequency)
Always Plot on the UPPPER LIMIT 
50 (hours), 5 (frequency) 5

7.  Always Plot the CUMULATIVE frequency
The second Point will be plotted at:
50 (hours), 15 (frequency) 
150 (hours), 15 (frequency)
Always Plot the CUMULATIVE frequency
150 (hours), 10 (frequency) 6

8.  The line goes through EVERY point
On a cumulative frequency diagram (graph) the line should be:
The line goes through EVERY point
A smooth curve passing close to the points
A straight line passing through the middle of the points 
Dot to dot OR a smooth curve going through ALL the points 7

9. The median is 
About 600 hours
About 500 hours
About 100 people 8

10. Find the median position on the cumulative frequency axis then go down to the x-axis to find the median value
The median is 
About 600 hours
About 500 hours
About 100 people 8

11.  The lower quartile is About 400 hours About 250 hours
About 50 people 9

12. The lower quartile is halfway between the first answer and the median
About 400 hours
About 250 hours
About 50 people 9

13. The 90th centile is 
About 950 hours
Not available
About 180 hours 10

14. The 90th centile means 90% of values are lower than this
The 90th centile is 
About 950 hours
Not available
About 180 hours 10

15. Class widths are normally:
The same size 
Different sizes
Don’t assume the class widths are the same, always look at the upper limit when you plot 11

16.  Just put numbers on your axes The x-axis should show:
Evenly spaced numbers
Just put numbers on your axes
The class labels (0<t….) 12

17. Revision Notes
Sketch the Cumulative Frequency Diagram of these results
Annotate with your notes
You need AT LEAST one note for every wrong answer

18. Frequency is the number of times you get an answer
The cumulative column ‘accumulates’ (adds up) the number of answers
The line goes through EVERY point
The 90th centile means 90% of values are lower than this
Always Plot on the UPPPER LIMIT
Just put numbers on your axes
Always Plot the CUMULATIVE frequency
Find the median position on the cumulative frequency axis then go down to the x-axis to find the median value
Don’t assume the class widths are the same, always look at the upper limit when you plot