Monday 17 September 2012

GROUP 1

Combined events are two or more events occurring at the same time or one after the other.

One example is:
(12 Possibilities)
 Heads 1  Heads 2  Heads 3  Heads 4  Heads 5  Heads 6
 Tails 1  Tails 2  Tails 3  Tails 4  Tails 5  Tails 6

There are 6 possible die outcomes each having a further 2 coin outcomes, giving a combined outcome of 12 possibilities. Therefore the probability of throwing a six and 'heads' is one outcome in twelve: . If the problem was changed to the possibility of throwing an odd number and 'tails', the table will show that this may occur 3 times, (1 tails, 3 tails, 5 tails) out of twelve outcomes, and therefore the probability is reduces to 312, or .

Another example is:
In a drawer, there are some white socks and some black socks. Tim takes out one sock and then a second. Draw a tree diagram to show the possible outcomes.

Example 10 Solution:


13 comments:

  1. When you gave the example with the table, you did not describe the scenario first, so it is confusing and harder to understand. Am i correct in saying that the scenario is: Tossing 1 coin and 1 die at the same time?

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  2. The examples don't really seem to show what a combined event is, only showing how to calculate probability.

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  3. Good Examples and Diagrams But so does the 2 tosses have to be the sam thing like a 2 coins or can it be two different things. Because having 2 different things will change the fairness of the experiment.

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  4. Kind of confusing this is. Maybe you can elaborate moar?

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  5. Well done! Good description which helps me understand combined events. A different example may work better.

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  6. What is the first table about? please state the scenario and you could explain what are combined events and how arethe examples given is an example of combined events?

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  7. For the table, you need to have the another top row and another row on the left and list out the stuff before showing the results like the first picture.

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  8. Maybe you could elaborate on how you formed the table

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  9. Needs an elaboration on the first table however generally very detailed

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  10. What was the scenario like in the first example? The probabilities are shown but are the coins thrown at the same time?

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  11. Chin Wai Kit9/18/2012 10:39 am

    You could have explained your own example so as to allow us to understand better

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  12. The explanation is quite good but it would help if it was explained in the context of the example given.

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  13. What was the scenario in the first given example? Maybe you have stated that.

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