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# Quick S1 terminology question watch

1. Hi everyone

I'm revising S1 and came across this as a "key point" in my revision guide (Edexcel).

One of the characteristics of the normal distribution given is "has a total area under the curve of unity".

What does this mean, anyone know?

thanks
rosie
2. (Original post by crana)
Hi everyone

I'm revising S1 and came across this as a "key point" in my revision guide (Edexcel).

One of the characteristics of the normal distribution given is "has a total area under the curve of unity".

What does this mean, anyone know?

thanks
rosie
Area of normal distribution curve = 1?
3. (Original post by Bhaal85)
Area of normal distribution curve = 1?

Indeed. You play with whatever you have until you can map it onto that model (ie, if you have an area of 10 under a curve, divide everything through by ten)

Once you've mapped it, the data you can gather from tables etc can be mapped back onto your original problem.
4. (Original post by Bhaal85)
Area of normal distribution curve = 1?
I did think that, but isn't that for the standard normal distribution as opposed to "the normal distribution", if you see what I mean?

They are made distinct in the book - it says for "the normal distribution" "has notation N(mu, sigma squared) but for the standard n.d. it says "denoted by Z where Z ~ N (0, 1^2)

so I dont know..it could be 1...

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