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Topics: Starter | Averages | Graphs | Statistics
- Mr Gray, Oldmachar
- Thursday, October 11, 2007
- "Would have been a good activity but we couldn't get the whole graph displayed on the screen/white board"
- Transum,
- Wednesday, October 17, 2007
- "Thanks for your feedback Mr Gray. The graph is designed to be as big as possible while still fitting on an 800x600 screen. If you are using Internet Explorer press the F11 key to hide the toolbars. If they don't all disappear you may need to right click and choose autohide."
- Karen, Folkestone
- Sunday, February 26, 2012
- "Have used and is a good starter, however blue does not display well in my classroom - any chance of option to change colour?"
- Mr Taylor, Gartree High School
- Wednesday, March 28, 2012
- "Hi, I think that the part of the starter about mode in incorrect- but perhaps you could correct me if I'm mistaken.
The graph we saw was somthing like Mon:8 Tues:2 Wed:6 Thurs:8 Fri:2 Sat:4 Sun:2 and in the answers they say that the "modal days" are Monday and Thursday. It's true that the maximum number of CDs were sold on Monday and Thursday, but the mode is a type of average just like the mean (and the mode of a data set is the data item that occurs most frequently). The most frequently occuring amount is two; so it would be correct to say that the "modal number of CDs sold" was 2. Modal day wouldn't really make sense in this context since the days of the week aren't the thing being counted." - Transum,
- Friday, March 30, 2012
- "Thanks Karen and Mr Taylor for your comments. The colour scheme has been changed and the error with the mode corrected. Your feedback is much appreciated."
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This starter has scored a mean of 2.9 out of 5 based on 17 votes.
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Answers
The total is 42
The data is bi-modal
The modes are 6 and 7
The mean is 6
The range is 7
Bar Chart showing the number of CDs sold in a week
Here is one possible bar chart meeting the criteria. There are others. Tuesday is the best sales day and the mean and range are both 4
Note to teacher: Doing this activity once with a class helps students develop strategies. It is only when they do this activity a second time that they will have the opportunity to practise those strategies. That is when the learning is consolidated. Click the button above to regenerate another version of this starter from random numbers.
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Teacher, do your students have
access to computers? Do you have "Laptops in Lessons"? Whether your students each have a TabletPC or share a desktop PC, this activity lends itself to eLearning (Engaged Learning). |
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Here is the URL which will take them to a concise version of this page.
Transum.org/go/?Start=September12
Here is the URL which will take them to some self-marking questions about mean, median and range.
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