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# Cumalitive Frequency Graph Question watch

1. Had a look at a S1 paper and got confused on the first question, could someone please help on the following :

For the greatest range, do I choose a range that has a interval thats 5units or can the range be as far as it needs to be ? Looking at the graph it looks like 30-35 as its the steepest ?

Part 2 I dont know where to beigin
2. Tried another go, does greatest range mean upper quartile ? Don't know how to do it which is quite demoralising seeing as its the first question .
3. For greatest range of marks don't you just do largest mark subtract smallest mark possible? 59.5-14.5 = 45 ?

Part 2 is a bit weird. From graph about 180 students got a grade below a C, so if the number of students who got a C is the same, don't you just read the mark off 360 on the y-axis?
4. (Original post by vc94)
For greatest range of marks don't you just do largest mark subtract smallest mark possible? 59.5-14.5 = 45 ?

Part 2 is a bit weird. From graph about 180 students got a grade below a C, so if the number of students who got a C is the same, don't you just read the mark off 360 on the y-axis?
That's what I thought at first, however the word 'greatest' threw me off a bit . Then I checked the mark scheme which has its answer as a range '39 to 41' is whats on the scheme . Though if I find the range normally, I get 40, and this is in the 39to41 bracket, but the answer I think requires a interval ? Usually it'll say 'accept values between' but I think I'm expected to give the range. Mark scheme ii and iv.

You got part 2 right , I'm not sure what they mean by maximum mark though, is it the highest mark possible so your at a C , eg a few off a B ? And why do you do the method you done , ie going to 27 marks then doubling 180 ?

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