Summarising Data (Grade 10 NSC Matric Mathematical Literacy): Flashcards

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Summarising Data
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Measures of central tendency

Show the central or typical position of data

Measures of spread

Describe how data is distributed or dispersed

Mean

Average; sum of values ÷ number of values

Formula for mean

Sum of valuesNumber of observations\frac{\text{Sum of values}}{\text{Number of observations}}

Median

Middle value when data arranged in ascending order

Critical step before finding median

Arrange data in ascending order (smallest to largest)

Median with even number of values

Average of the two middle values

Mode

Data value that appears most often in a dataset

Modal class (grouped data)

Group/class interval with the highest frequency

Range formula

Highest data value - Lowest data value

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