S1 Normal Distribution

P(Z>a)=0.2

I really don't understand.

P(Z>a)=0.2

I really don't understand.

So P(Z<a) = 0.8

Yeah I got that bit but 0.8 isn't on the table so how do you find a?

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.

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.
:confused:

Edit: Yeah, I am doing Edexcel

The answer in the back of the book is 0.8416 not 0.84 though.
:confused:

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.

There's a table on the next page! I never noticed that before...
Cheers :biggrin:

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