## Data, Data Handling and Probability Terms

**Bar chart:**A graph that uses parallel bars of equal width to display information.

**Column:**Items arranged in a vertical line.

**Data:**Numerical information that is used in statistics.

**Frequency:**

• The number of times a particular item appears in a set of data.

• The number of times that an event has occurred.

**Graph:**A drawing that shows a relationship between sets of data.

**Mean:**The average of a number of different amounts. To calculate the mean: sum of numbers ÷ number of numbers.

**Median:**When numbers are arranged from least to greatest, the middle number is the median.

**Mode:**The number that occurs most often in a set of numbers.

**Pie chart:**A circular diagram which is used to display data as sectors or sections of a circle (360ยบ).

**Range:**The difference between the greatest and the least value in a set of data.

**Certain event:**An event that will definitely happen. A certain event has a probability of one.

**Chance:**The likelihood that a particular outcome will happen.

**Equally likely:**Events that have the same chance or probability.

**Event:**A possible outcome. Something that may happen.

**Favourable outcome:**In probability, the outcome you are interested in measuring.

**Impossible event:**An event that will definitely not happen. An event with a probability of zero.

**Odds:**The ratio of favourable outcomes to unfavourable outcomes.

**Outcome:**One of the possible results in a probability experiment.

**Probability:**The measure of how likely an event is. Its value lies between 0 (impossible event) and

1 (certain event).

**Random selection:**A chance pick from a number of items.

**Tree diagram:**A diagram shaped like a tree. Helps in showing possible outcomes of an event.

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