The first few problems ask you to "describe" a random variable,which means:
Give the sample space S (the result of the random experiment,from which the output of the random variable is calculated);
Give RX (you may schematize it if it is very complicated orinfinite);
Give fX (you may use fractions or decimals) and show how it wascalculated unless it is very simple;
Problem 2:
Suppose we have a sack with 2 red balls and 5 black balls, andwe draw balls without replacement until a red ball isdrawn. Let X = "the number of balls drawn".
Describe the random variable XX.
