Question

Solve the following :

Identify the random variable as either discrete or continuous in each of the following. Write down the range of it.

20 white rats are available for an experiment. Twelve rats are male. Scientist randomly selects 5 rats number of female rats selected on a specific day

Answer 1

Let X = number of female rats selected on a specific day

Since the total number of rats is 20 which include 12 males and 8 females, X takes the finite values

∴ random variable X is discrete.

Range = {0, 1, 2, 3, 4, 5}