Histograms (Leaving Cert Mathematics): Flashcards

Graph showing frequency distribution of continuous grouped data

Continuous data organized into classes

Groups that continuous data is organized into

No gaps between bars (they touch)

Frequency - how often values occur in that class

Equal class intervals (same range of values)

Label both axes clearly

Class interval with the highest frequency

Identify which class has the highest frequency

$(n + 1) \div 2$

Add frequencies from lowest until reaching median position

As an interval/range (e.g., 30-40), not single number

Histogram: continuous; Bar chart: discrete

Confusing mode (exact value) with modal class (interval)