Starter Find the probability that a person is ready for digital TV

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Presentation transcript:

Starter Find the probability that a person is ready for digital TV Colmnar Bruntion poll was published about people’s readiness for digital TV Are you ready for digital TV NZ European Other TOTALS Yes 4045 1673 5718 No 828 390 1218 4873 2063 6936 Find the probability that a person is ready for digital TV Given that a person is ready for digital TV, find the prob that they are NZ European Is being ‘NZ European’ and being ‘ready’ for digital TV independent of each other? 5718/6936 4045/5718 NO

Note 11: Probability Trees Tree diagrams are useful to display possible ways of getting given results. If events are connected by and probabilities are multiplied If events are connected by or probabilities are added

Example: A bag contains two white marbles and two black marbles. One marble after another is drawn (without replacement) until two black marbles have been drawn. What is the probability that exactly three draws are required?

✔ ✔ P(exactly 3 draws for 2 black marbles) = ⅓

Page 170 Exercise H