Probabiltiy question Watch

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Cobblers is a shoe business. It makes one style of shoe in several different sizes. Let X represent the shoe size. The demand for sizes of shoe is modelled by

P(X=r) = k(r-3)(12-r) for r = 4, 5, 6, 7, 8, 9, 10, 11.
P(X=r) = 0 otherwise.

One Monday morning, Cobblers recieves 5 orders. It is out of stock of sizes 6, 10 and 11, but has ample stocks of the rest.

Find the probability that Cobblers can satisfy at least two of the orders.

I got the answer to be 0.955, but I don't have the markscheme. Could somebody check the answer for me? Thanks.
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Jonny W
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I get 0.955 too.
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__WiZaRD__
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is this for S1? If yes, what paper?
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It's...

OCR MEI Jan 2004 I think.
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