Problem of cumulative distribution

kin · #1 $Old$ October 29th, 2009, 07:39 AM

i cant find the constant when i integrate the density function ...

please show steps .............

matheagle · #2 $Old$ October 29th, 2009, 08:32 AM

IS 0<x<1? If so, this is a Beta rv.

AND why don't you show your 'steps'?

kin · #3 $Old$ October 29th, 2009, 06:28 PM

Quote:

Originally Posted by matheagle $View Post$

IS 0<x<1? If so, this is a Beta rv.

AND why don't you show your 'steps'?

the range is not given ......

so i let the density function = K(1-x)^4 ,(where K is a constant)
and integrate it from -∞ to ∞, which is supposed to be equal to 1.

however, the result is undecisive after the integration,
so i cant find the constant K....

matheagle · #4 $Old$ October 29th, 2009, 07:05 PM

You need to know the support and I'd bet it's 0<x<1.
The support is not all Reals.

kin · #5 $Old$ October 29th, 2009, 08:44 PM

Quote:

Originally Posted by matheagle $View Post$

You need to know the support and I'd bet it's 0<x<1.
The support is not all Reals.

if your guess is true , it will be simple...
any reasons why u bet it's 0<x<1...?