probability

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• Probability
• expressions of probability
• fraction
• decimal
• percentage
• experimental probability
• relative frequency = number of favourable outcomes / total number of trials
• relative frequencies are probabilities based on experiments
• theoretical probability
• number of favourable outcome / total number of outcomes
• probability of an event not happening
• the probability of an event + probability of event not happening=1
• mutually exclusive events
• cannot happen at the same time
• tables or frequency trees can be used to show all outcomes and data about them
• Probability is the likelihood or chance of an event occurring. Probability = the number of ways of achieving success. the total number of possible outcomes.
• events
• certain
• p=1
• impossible
• p=0
• likely
• unlikely
• combined events
• when >=2 events happen at the same time
• Venn diagrams
• show mathematical relationship between sets of data
• ? means is an element of a set
• { } are used to list members of a set
• A ? B = intersection = the set of all elements that are in both set A and B
• A ? B = union = set of all elements that are in either set A or set B or in both sets