5 lb practise book, chap-30, no-3

[anik1989]

The random variable X has the following continuous probability distribution in the range 0<-x<-root2 , as shown in
the coordinate plane with X on the horizontal axis:


The probability that X < 0 = the probability that X > rot2 = 0.
What is the median of X?

TOTALLY AMBIGUOUS TO ME

[tommywallach]

Hey Anik,

As the beginning of this chapter warns, many of these questions are harder than anything you would actually see on the GRE. The reason they're included is some people like to practice really hard questions, so that on test day, they feel like everything is within their grasp.

The explanation in the back of the book explains this question as well as it can be explained. If there's some particular part of the explanation that throws you off, feel free to ask me about it, otherwise, just try to take what you can from it, and move on. This is harder than anything on the real test! : )

-t

[anik1989]

thank you for your reply. i thought there might be another ans for this question

[tommywallach]

Nope! : )

-t

[anik1989]

is there any more simplyfying rule besides what is written in the book?

[tommywallach]

There's no other way to solve it. It requires an understanding of a probability distribution expressed as a graph, in which case the space underneath the graph represents 100% of the probabilities for a given function. Think about it in terms of the bell curve, in which the space underneath the graph represents the total outcomes of a given set of data.

-t