Measures of Spread (Grade 12 NSC Matric Mathematical Literacy): Flashcards

$\text{Range} = \text{Highest value} - \text{Lowest value}$

Values are clustered close together

Divide data into four equal parts, each with 25% of values

Median of lower half; 25% of data below this value

Median of upper half; 75% of data below this value

Minimum, $Q_1$, $Q_2$, $Q_3$, Maximum

$\text{IQR} = Q_3 - Q_1$

Spread of middle 50% of data, ignoring extreme values

Divide data into 100 equal groups

Overweight