# Thread: Help me determine the quartiles of random variables

1. ## Help me determine the quartiles of random variables

F(x)=0 for x<0
=1/3 for 0<=x<=1/2
=1/2 for 1/2<=x<=3/4
=1 for x>=3/4
Determine,for the random variableX,the
(a) upper quartile
(b) lower quartile
(c) propability mass function of X

2. ## Re: Help me determine the quartiles of random variables

Hey lancelot.

Hint: Try relating the quartiles to a probability expression (i.e. P(X < x) = q for some quartile value q).