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# Further Maths need help! watch

1. Ok question is:

Q) work out V to 2 d.p if:

and X ~ N

So I did:

If I look for 0.6076 on the data sheet it comes to the number:

So put in the numbers to the equation:

and you come out with:

But that isn't the end answer is it because that is the number for less than approximately 60% - so what do I do now?

Thanks in advance and please, if i've done this wrong tell me!
2. (Original post by Dededex)
Ok question is:

Q) work out V to 2 d.p if:

and X ~ N

So I did:

If I look for 0.6076 on the data sheet it comes to the number:

So put in the numbers to the equation:

and you come out with:

But that isn't the end answer is it because that is the number for less than approximately 60% - so what do I do now?

Thanks in advance and please, if i've done this wrong tell me!
You don't do a 1 minus, you simply take the negative value of the z-score of 0.6076 (Because of the symmetry property of the bell curve, and the fact that 0.3924 can't be found in the table)
3. (Original post by O93)
You don't do a 1 minus, you simply take the negative value of the z-score of 0.6076 (Because of the symmetry property of the bell curve, and the fact that 0.3924 can't be found in the table)
yeah I understand now, but you have to do 1 minus in order to get 0.6076 right?
4. (Original post by Dededex)
yeah I understand now, but you have to do 1 minus in order to get 0.6076 right?
Yes you have to do a 1- to look up the value in the table, but you don't use it as your final value (should have made that clearer sorry)
5. (Original post by O93)
Yes you have to do a 1- to look up the value in the table, but you don't use it as your final value (should have made that clearer sorry)
Don't worry mate; one more question though for anyone surfing this thread:

How would I do ? It's different to the first...
6. (Original post by Dededex)
Don't worry mate; one more question though for anyone surfing this thread:

How would I do ? It's different to the first...
isn't it equal to P(x<u) = 0.8959?

use the table to find the value for u.
7. (Original post by anhthenguyen)
isn't it equal to P(x<u) = 0.8959?

use the table to find the value for u.
Oh yeah sorry I'm really bad at Stats XD
8. (Original post by Dededex)
Oh yeah sorry I'm really bad at Stats XD
No worries, I am not good at Stats either. :d

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