Re: maths

Posted by ritu on May 05, 2012; 12:23am
URL: http://discussion-forum.276.s1.nabble.com/maths-tp7526962p7529021.html

hi AJ....U CAN DO FIRST QUESTION LIKE THIS....
WE KNOW THAT THE FUNCTION OF "STANDARD" NORMAL DEVIATE ie.Z IS 1/root 2 pie.e^(-x^2/2)...{check
 any normal stats book for this function if u cant read it properly}
now try to imagine a standard normal curve.....area covered btwn (-1.96,1.96) is 95% or 0.95....
this means we are left with 0.05 area of which 0.025 each lies to the left and right of(+- 1.96)
now we want area from 1.96 till infinity.....
integral of {1/ root 2 pie .e^-x^2/2} over (1.96, infinity) =0.025
we can take out constant 1/root2 pie....with the desired integral in brackets....taking constant other side u get answer as 0.025(under root 2 pie)....ie. option d
i kno its quite messy ....sry dnt have access to this graph technology...:P