HiOn a cumulative frequency diagram, the median time is found by going halfway up the cumulative frequency (vertical axis), in this case up to 40 (ie a half of 80) and reading off the corresponding time. On the red curve this gives a median of 25. Can you see that?
The quartiles are found by going a quarter (and then three quarters) of the way up the vertical axis and reading off the corresponding times.
Let us know what you get.
Hi,What information is each graph giving you? For example, the red graph passes though the point (15,20). What is the meaning of this point?
Actually, the point (15,20) tells you that 20 pupils completed the task in 15 minutes OR LESS.Hi,
good question. The point 15,20 tells me that 20 pupils completed the task in 15 minutes
but I’m not sure how to proceed from here to see the overall result ?
ie who was the slowest at completing the task
thank you so much