Which of the following are valid ways of expressing probability? Select one option.

• A. ó
• B. 557
• C. 104
• D. 50%

Answer: (D)

Verified step by step guidance

1. Understand that probability is a measure of how likely an event is to occur, and it can be expressed in several equivalent ways: as a fraction, a decimal, or a percentage.
2. Recognize that a probability must be a number between 0 and 1 when expressed as a fraction or decimal, where 0 means impossible and 1 means certain.
3. Identify that expressing probability as a percentage involves converting the decimal form by multiplying by 100 and adding the percent symbol (%). For example, a probability of 0.5 is equivalent to 50%.
4. Evaluate the given options to see which one correctly represents a probability value within the valid range and in a proper format (fraction, decimal, or percentage).
5. Conclude that the option expressed as '50%' is a valid way to express probability because it clearly indicates a probability of 0.5 in percentage form.