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**pavino14****Member**- Registered: 2017-07-09
- Posts: 3

The probability density function of a discrete random variable X is given by P(X=x)=a(1/2)^x ..... Then what is the value of a is..?????

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**bob bundy****Administrator**- Registered: 2010-06-20
- Posts: 8,273

hi pavino14

Welcome to the forum.

The area under a pdf has to be 1 in total so you need to work out 'a' when

Are you able to do the integral?

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**pavino14****Member**- Registered: 2017-07-09
- Posts: 3

I'm just learning integral...Thank you admin ..

*Last edited by pavino14 (2017-07-16 03:06:04)*

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