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February 28, 2015

February 28, 2015

Posted by **Morgan** on Wednesday, March 16, 2011 at 12:17am.

I have the answers but do not know how to get them. I'm trying to use a tree diagram but I am confusing myself.

- Stats (probability) -
**PsyDAG**, Wednesday, March 16, 2011 at 12:14pm(i) Choosing the first girl with blue eyes = 3/10. Since there is no replacement, the probability of the second girl having blue eyes = 2/9. The probability of both/all occurring is found by multiplying the individual probabilities.

(ii) Do similar process with non-blue probabilities.

(iii) This is either one or two have blue eyes. You have probability of two from (i). Probability of one = 3/10 * 7/9 or 7/10 * 3/9. (note that they have the same product). Either-or probability is found by adding the individual probabilities.

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