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Conditional probability with in normal distribution

Hi,
The formula for conditional probability is
P(A I B)=P(A n B)/P(B)

but why in normal distribution we only do like that p(A)/P(B)
Reply 1
PPPPPPPRRRRRROOOOOOO.PNG

last part
Original post by Qer


last part


Because (Y<μ)(Y<17)=(Y<μ)(Y<\mu)\cap (Y<17)=(Y<\mu) as the set (Y<μ)(Y<\mu) is contained ENTIRELY in the set (Y<17)(Y<17). So the intersection between the two sets is simply the smaller set.
Reply 3
Original post by RDKGames
Because (Y<μ)(Y<17)=(Y<μ)(Y<\mu)\cap (Y<17)=(Y<\mu) as the set (Y<μ)(Y<\mu) is contained ENTIRELY in the set (Y<17)(Y<17). So the intersection between the two sets is simply the smaller set.


Thankyou
Really expecting answer from you
Thanks once again
Reply 4
Hi need help in part c of q 5
Estimate the no of people. ......
What I have done so far is 1/3×15+2×9+1/2×6=26

But in markscheme they don't multiply 9 by 2
I got 2 by finding class width 6.5-4.5=2

Can anyone explain me
http://pmt.physicsandmathstutor.com/download/Maths/A-level/S1/Papers-Edexcel/June%202014%20(R)%20QP%20-%20S1%20Edexcel.pdf

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