Probability is how likely something will happen, usually expressed as a
percent. A single probability is how likely a single event will happen.
To calculate a single probability, divide the number of favorable
outcomes by the number of possible outcomes to get a decimal, and
multiply the decimal by 100 to get a percent.
For example, a coin flip has 2 possible outcomes: heads or tails. To
calculate the probability of flipping heads, do the following:
favorable outcomes = 1
possible outcomes = 2
decimal = 1 ÷ 2 = 0.5
percent = 0.5 × 100 = 50