Formulas and rules
Every key math formula and rule, organised by topic and school level, with examples and study tips.
Statistics 3
M4
Mean
mean = sum of values / number of values
The mean averages the data.
M4
Median, mode and range
Median is the middle value when ordered. Mode is the most frequent. Range is highest minus lowest.
M4
Probability
P = favourable outcomes / total outcomes
Probability runs from 0 (impossible) to 1 (certain).