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I'm not too sure where to make the divisions between the classes this data either... can anyone help please?
Weight (lbs) class width Frequency Frequency Density
25-29 4 2 0.50
30-34 4 6 1.50
35-39 4 17 4.25
40-44 4 24 6.00
45-49 4 35 8.75
50-54 4 27 6.75
55-59 4 19 4.75
60-64 4 13 3.25
65-69 4 5 1.25
70-74 4 2 0.50
Another quick question, when drawing a histogram, do I use a broken x-axis at the beginning as the data starts at 25? Or do I just start it from 25?
Thanks!
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Whenever you're given a data table where the class boundaries don't match up, I'd say it's safe to act as if the upper boundary was one higher for each class. (Or to be precise, very very slightly less than one)
They're doing it like that because they don't want to put classes of (for example) 25-30 and 30-35, because then there's confusion as to where 30 goes.
The best way of showing classes is by something like 25≤x<30.
Why did the vector cross the road?
It wanted to be normal.
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Ok thanks.. I was thinking, as the question says that the weight values are rounded to the nearest pound, could I split the classes at .5 so the first would end at 29.5 and the second would begin at 29.5 etc?
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Ah, well in that case yes, your way is right.
In fact, forget what I said earlier, that's the standard thing to do (unless you're dealing with ages).
Why did the vector cross the road?
It wanted to be normal.
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