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OCR S1 Geometric Distribution watch

1. I'm stuck on part (ii)

How do I solve when there are two inequalities?

I'm also stuck on part (iv). Is this a probability distribution now?

2. What part (iv) is saying is that and ; you have to find , which you can work out by considering possible combinations of and their probabilities.
3. (Original post by nuodai)
What part (iv) is saying is that and ; you have to find , which you can work out by considering possible combinations of and their probabilities.
That made no sense whatsoever. Explain further please. Do you mean I should use combinations?

3C1(0.2)^2(0.8)^1=0.096

??
4. (Original post by nuodai)
What part (iv) is saying is that and ; you have to find , which you can work out by considering possible combinations of and their probabilities.
Help!
5. (Original post by No!)
Help!
I would have before you said that I'm not paid to do this you know.
6. (Original post by nuodai)
I would have before you said that I'm not paid to do this you know.
ok I'm just so angry because I don't understand the question. I don't understand what you implied to do. I'm not good at maths, please explain it more simply.

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