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# S1 Normal Distribution watch

1. P(Z>a)=0.2

I really don't understand.
2. (Original post by snookin)
P(Z>a)=0.2

I really don't understand.
So P(Z<a) = 0.8
3. Yeah I got that bit but 0.8 isn't on the table so how do you find a?
4. (Original post by snookin)
Yeah I got that bit but 0.8 isn't on the table so how do you find a?
IF you are doing Edexcel then 0.7995 is close enough.
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5. (Original post by steve2005)
IF you are doing Edexcel then 0.7995 is close enough.
The answer in the back of the book is 0.8416 not 0.84 though.

Edit: Yeah, I am doing Edexcel
6. (Original post by snookin)
The answer in the back of the book is 0.8416 not 0.84 though.

Edit: Yeah, I am doing Edexcel
OK they have used the table on the next page BUT it does not matter too much. I think 0.84 would get full marks.
7. There's a table on the next page! I never noticed that before...
Cheers

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