please explain ""cumulative distribution function""..what a cdf is ...give a detail explanation..infact i am confused in it..i do have the topic in my book but i am not getting it at par...

and also please explain the solutions for the following 2 questions related to cdf..

Q1:it is given that the cdf of a discrete random variable is F(x)=1-(1/2)^x+1 , for x=0,1,2,.... and zero for x<0..

Find a) P(X=3) b)P(7<=X<10) c) pmf of X

Q2:the cdf of a r.v is given by

F(x)=0.25e^x if x<0

0.5 if 0<=x<1

1-e^-x if 1<=x

Find a)P(X=0) b)P(2<X<5) c)P(X<-3) d) P(X<1)

now please ,dont just answer my questions but give a detailed explanation also because i do have the solutions for the 2 questions but i am not able to understand properly ..

thanks

i would really appreciate if sir kriz would answer my queries..

and also please explain the solutions for the following 2 questions related to cdf..

Q1:it is given that the cdf of a discrete random variable is F(x)=1-(1/2)^x+1 , for x=0,1,2,.... and zero for x<0..

Find a) P(X=3) b)P(7<=X<10) c) pmf of X

Q2:the cdf of a r.v is given by

F(x)=0.25e^x if x<0

0.5 if 0<=x<1

1-e^-x if 1<=x

Find a)P(X=0) b)P(2<X<5) c)P(X<-3) d) P(X<1)

now please ,dont just answer my questions but give a detailed explanation also because i do have the solutions for the 2 questions but i am not able to understand properly ..

thanks

i would really appreciate if sir kriz would answer my queries..

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