cumulative frequency graph help????? Watch

myii
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lol
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mqb2766
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For a) the information is directly given on the graph. Can you state what you got and I'll check.
For b) is this what you were asking about in another post? As it said, remove some of the smaller data. Again, if you want to check answers, just post what you've done.
(Original post by heyitshamda)
guysss how do you work out a) and b) of this question i wanna compare my answers.. also i don’t know how to do b) so i need help
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myii
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lol
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mqb2766
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I don't think you're calculating the Q values, correctly. If you look at the graph, they don't divide up the "y" axis into quarters?

First quartile should be 18 + (100-18)/4 = 3/4*18 + 100/4
Median is correct 18 + (100-18)/2 = 18/2 + 100/2 = (100+18)/2
Third quartile should be 18 + 3(100-18)/4 = 18/4 + 3*100/4

Edit: range is not right nor b), but we'll do those afterwards.
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myii
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ohhhhh okay.. what would be the range? 100-18?
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mqb2766
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No, the range is defined in terms of the min and max data values (x-axis).
Edit - note the Q values in the previous post refer to the y-axis. You have to map them back to the x-axis, like you have done previously.
(Original post by heyitshamda)
ohhhhh okay.. what would be the range? 100-18?
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myii
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and part b would the graph go higher or lower?
(Original post by mqb2766)
No, the range is defined in terms of the min and max data values (x-axis).
Edit - note the Q values in the previous post refer to the y-axis. You have to map them back to the x-axis, like you have done previously.
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HamzaD
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(Original post by heyitshamda)
guysss how do you work out a) and b) of this question i wanna compare my answers.. Also i don’t know how to do b) so i need help
Attachment 830264
can you come home????
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mqb2766
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Imagine the median was equal to the mean (roughly it is ...).
What would the new curve look like if the median was larger?
(Original post by heyitshamda)
and part b would the graph go higher or lower?
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myii
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the curve will go abit lower.. please tell me the answer because im in such a rush i wanna know if i am correct
(Original post by mqb2766)
Imagine the median was equal to the mean (roughly it is ...).
What would the new curve look like if the median was larger?
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mqb2766
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shifting to the right would be a better way to describe it.
(Original post by heyitshamda)
the curve will go abit lower.. please tell me the answer because im in such a rush i wanna know if i am correct
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myii
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would this be correct?
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mqb2766
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Looks ok, as long as you understand it.
(Original post by heyitshamda)
Attachment 830388
would this be correct?
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myii
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(Original post by mqb2766)
Looks ok, as long as you understand it.
thank you so much i do understand it
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