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# Statistics 2 Probability Distribution watch

1. I'm struggling with part 4e. I think the new graph should have a negative skew because the mode is greater than the mean but the answer in the mark scheme doesn't seem to have a negative skew. Can someone please help me figure it out? Thank you in advance.
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2. I haven't tried to do the question but if there much difference between your mean and mode? Because if they're very close maybe you're expected to treat them as equal and draw a normal distribution.
3. (Original post by Keira Larkin)
I'm struggling with part 4e. I think the new graph should have a negative skew because the mode is greater than the mean but the answer in the mark scheme doesn't seem to have a negative skew. Can someone please help me figure it out? Thank you in advance.
It would be a ‘uniform distribution’ but if you haven’t done that chapter yet obviously you wouldn’t know that so dont worry about it
4. (Original post by Keira Larkin)
I'm struggling with part 4e. I think the new graph should have a negative skew because the mode is greater than the mean but the answer in the mark scheme doesn't seem to have a negative skew. Can someone please help me figure it out? Thank you in advance.
There is a whole branch of mathematics devoted to the study of call centre loading and similar, but I don't think knowledge of that will be expected for one point! Commonsense would suggest that the probability density function probably shouldn't increase with call duration and probably shouldn't have a hard cut-off at ten minutes. I would suggest either something that decreases with call duration, but without a hard cutoff, or something with a hump at some value like three minutes and then gradually tailing off for longer call durations.
5. (Original post by old_engineer)
There is a whole branch of mathematics devoted to the study of call centre loading and similar, but I don't think knowledge of that will be expected for one point! Commonsense would suggest that the probability density function probably shouldn't increase with call duration and probably shouldn't have a hard cut-off at ten minutes. I would suggest either something that decreases with call duration, but without a hard cutoff, or something with a hump at some value like three minutes and then gradually tailing off for longer call durations.
That makes sense. Thank you!

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