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S1, post your doubts here....

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what are changes to values if classes were changed ?
i wrte mean decreases sd decreases median decreases
 
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The mean, median, quartiles, and the interquarile range will ALL decrease by 5 minutes
The standard deviation will stay the same
I'm pretty sure about my answer.

And yes, k = 1/5 = 0.2; remember that they gave you the cumulative frequency table, not a normal p.d.f
 
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I'm so mad at myself because I didn't put the right max and min values on the box plot, which was like the easiest thing on the paper. ARRRRGGGHHH. And I'm not sure if I got the mean and standard deviation correct for that question where you had to alter the boundaries....

Is there going to be an unofficial mark scheme out soon?
 
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okaay dont forgeet: http://www.thestudentroom.co.uk/showthread.php?t=2355116
I'm so mad at myself because I didn't put the right max and min values on the box plot, which was like the easiest thing on the paper. ARRRRGGGHHH. And I'm not sure if I got the mean and standard deviation correct for that question where you had to alter the boundaries....

Is there going to be an unofficial mark scheme out soon?
 
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