S1 Nov 04 - I don't get the mark scheme at all. Watch

Christophicus
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http://www.school-portal.co.uk/Group...ourceId=197163

Q4a
I don't have a clue where they've got 2alpha from.

(If this is the case with all edexcel mark schemes, I'm sticking with solomon for tonight!)
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TheDuck
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(Original post by Widowmaker)
http://www.school-portal.co.uk/Group...ourceId=197163

Q4a
I don't have a clue where they've got 2alpha from.

(If this is the case with all edexcel mark schemes, I'm sticking with solomon for tonight!)
I may be being stupid but surely, the sum of the probabilties for each outcome have to add up to 1? The probability is 0.2 for -3 and -2, α for -1 and 0 and 0.1 for 1 and 2. The sum of these is
0.6+2α=1, so α=0.2?
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Christophicus
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(Original post by TheDuck)
I may be being stupid but surely, the sum of the probabilties for each outcome have to add up to 1? The probability is 0.2 for -3 and -2, α for -1 and 0 and 0.1 for 1 and 2. The sum of these is
0.6+2α=1, so α=0.2?
Yh I realised about an hour after I'd posted the mistake I'd made. Couldn't be bothered to say anything.
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