Measure of Centre (Leaving Cert Mathematics): Flashcards

Single value representing typical/central point of data

Mean, median, and mode

The average

$\frac{\sum x}{n}$

Sensitive to extreme values (outliers)

Middle value when data ordered smallest to largest

Average of the two middle numbers

Less affected by outliers than the mean

Most frequently occurring value in the data set

Data set with one mode

Data set with more than one mode

For balanced data without outliers

For skewed data or when outliers are present

For categorical data or to identify most common value