Continuous prob. distribution (1 Viewer)

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

i really dont know how to ue the Latex. it doesnt work although i try it for many times.

so, im new to this chapter. maybe this question is easy to be solved, but i cant get it.

a continuous random variable X has cumulative distribution as attached.
the question is what is the value of alpha.
i try doing like this but it doesnt give any answer though.

F(-1) = 0 = (alpha)(-1)+(alpha)

what is the working so that i can get the answer.


Last edited:
Originally posted by denian
it doesnt work although i try it for many times.

ok, if f(x) is a probability distribution I guess what matters the most is that:
[tex]\int_D f(x)dx = 1[/tex]
where D is the interval where f is defined (you didn't mentioned it in your question....)
but that is a cumulative distribution.
i copy the whole thing from the question.

do i need to change it to probability density function first, then continue to work on it.
then alpha is 1/3 because as I remember [itex]f(\infty) = 1[/itex]
and also the function is continuous....
ok. thank you
Last edited:

The Physics Forums Way

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving