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10 
Probability Trees Calculating probabilities from tree diagrams by multiplying along branches and adding between branches. Tree diagrams with and without replacement. Intersection and Union problems 
Theta (new & old & workbook) Ex 22.02 
A tree diagram is a way of showing all possible options 

ExplanationOverviewMultiply along branchesAdd between branchesMouseover above 

Select a card from a pack of 52 cards. Was it a heart? REPLACE the card and select a second card 

Selection with replacement Probabilities P(2 hearts)= P(1 heart)= Mouseover above 

Select a card from a pack of 52 cards. Was it a heart? KEEP the card and select a second card 

Selection without replacement Probabilities P(2 hearts)= P(1 heart)= Mouseover above 

Dodgy Dave's freight company sends 35% of packages 'standard' and the rest by 'express' 20% of 'standard' freight is lost 

Form a probability tree Fill in known probabilities Fill in other probabilities
Calculate Mouseover above 
