Impossible : An event is impossible if it has a probability of 0.

Outcome : A result of a random experiment.

Probability : A probability is a number between 0 and 1 that describes how likely an outcome is. For discrete events that are equally likely the probability can be calculated by dividing the number of favorable outcomes by the number of possible outcomes.

Ten thousandth : Ten thousandth refers to the number $\frac{1}{10,000}=0.0001=10^{-4}.$

Unlikely : An event in a probability experiment in unlikely if the probability of it happening is low.

Maximum : The maximum of a set of numbers is the highest of the numbers in the set. A function has a maximum at $x_0$ if $f(x_0)\geq f(x)$ for all $x.$

Number : A number $x$ is a mathematical symbol representing a quantity.

Median : The median of n numbers is defined as the $\frac{n}{2}$-th biggest number in case of even $n$ and as the average of the $\frac{n-1}{2}$-th biggest number and the $\frac{n+1}{2}$-th biggest number in case of odd $n.$ The median of numbers is a statistic that can be representative of a typical element of a collection of numbers. It is an alternative to the average of numbers.

Number : A number $x$ is a mathematical symbol representing a quantity.

Third : A third either refers to the third object in an ordering or to the number $\frac{1}{3}=0.\overline{3}.$