SOCR EduMaterials Activities Discrete Probability examples
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* <math>0.7^4 0.3</math> | * <math>0.7^4 0.3</math> | ||
* '''Example 5:''' | * '''Example 5:''' | ||
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<divide/> | <divide/> | ||
<ci> 1 </ci> | <ci> 1 </ci> | ||
<ci> 0.30 </ci> | <ci> 0.30 </ci> | ||
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Revision as of 21:18, 23 April 2007
- Description: You can access the applets for the above distributions at http://www.socr.ucla.edu/htmls/SOCR_Distributions.html .
- Example 1:
Find the probability that 3 out of 8 plants will survive a frost, given that any such plant will survive a frost with ptobability of 0.30. Also, find the probability that at least 1 out of 8 will survive a frost. What is the expected value and standard deviation of the number of plants that survive the frost?
- Answer:
- ,
- E(X) = np = 8 * .3 = 2.4
- Sd(X) = sqrt(npq)
- Example 2:
If the probabilities of having a male or female offspring are both 0.50, find the probability that a familiy's fifth child is their first son.
- Answer:
- 0.505
- Example 3:
- a. ,
- b. ++
- Example 4:
- 0.740.3
- Example 5:
< divide / > < ci > 1 < / ci > < ci > 0.30 < / ci >