Definition: Probability — Psychometric Glossary
Probability is the measure of the likelihood that an event will occur. An essential mathematical concept in the psychometric test.
- Definition and basic formulas
- Simple and conditional probability
- Probability exercises adapted to the psychometric test
- Quick solving methods
What is probability?
Probability is a branch of mathematics that measures the likelihood that an event will occur. It is expressed as a number between 0 (impossible) and 1 (certain), or as a percentage between 0% and 100%.
The basic formula is: P(A) = number of favorable outcomes / total number of outcomes. For example, the probability of rolling a 6 on a die is 1/6, because there is 1 favorable outcome out of 6 possible outcomes.
Probability in the psychometric test
Probability questions in the mathematics section of the psychometric test cover simple probabilities, compound probabilities, and sometimes conditional probabilities.
These questions often involve counting (combinations and permutations) and understanding concepts like independent events, mutually exclusive events, or complementary events.
Frequently asked questions
What probability formulas should I know?
For the psychometric test, master simple probability (favorable/total outcomes), addition for mutually exclusive events, multiplication for independent events, and complement (P(not A) = 1 - P(A)).
Are probability questions common in the test?
Yes, probability and combinatorics questions represent a significant portion of the math section. They are often considered among the most challenging.
How to quickly solve a probability problem?
First identify the sample space, then count favorable outcomes. Use probability trees or tables for compound problems. Regular practice on Hiku will help you gain speed.
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