theoretical probability p = number of successful outcomes total possible outcomes Example Find the probability of scoring a 3 on an unbiased 6 sided die 1 6 number of successful outcomes (one 6 on the die) total possible outcomes (6 possible outcomes) experimental probability or relative frequency p = number of successful outcomes total number of trials Example Complete a relative frequency table from these results: The recorded results of a 5 sided spinner being spun R is Red, Y is Yellow, B is Blue R, B, R, Y, Y, R, B, Y, R, R, Y, B, B, R, Y, R, Y, R, B, R Colour Red Yellow Blue Frequency 9 6 5 Relative Frequency 20 The probability of the spinner landing on a yellow is: 5 20

Probability Tree Diagrams A tree diagram for whether it is raining or not rain The outcome is written at the end of the branch not rain