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# S1 Histograms watch

1. Hey,

I was wondering when do you need to work out the relative frequency and when do you need to work out the frequency density and hence draw their graphs. The SI edexcel book doesn't actually tell you which is rather irksome. Can somebdy help?

2. (Original post by anguman)
Hey,

I was wondering when do you need to work out the relative frequency and when do you need to work out the frequency density and hence draw their graphs. The SI edexcel book doesn't actually tell you which is rather irksome. Can somebdy help?

when they ask you to draw a histogram you must find the relative frequency. say you have frequency 50 and the group is 10-14, you do frq/class width
so 50/5 which is 10. this will give you the height of ur bar (freq density) to check the area of the bar should equal 50 so 10*5 which is 50
you do relative when they ask u to draw relative frequency histogram

ps: pls help with my question on interpolation the threads called s1 edexcel calculator
3. (Original post by anguman)
Hey,

I was wondering when do you need to work out the relative frequency and when do you need to work out the frequency density and hence draw their graphs. The SI edexcel book doesn't actually tell you which is rather irksome. Can somebdy help?

is it just me or is that textbook one of the worst? I just find it very unclear and unhelpful!
rosie
4. Yes...its unclear
5. (Original post by ruth_lou)
Yes...its unclear
very unclear. ive found 6 wrong answers.
dont trust the book! you will fail!!!!!!

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