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September 21, 2014

September 21, 2014

Posted by **Anonymous** on Friday, February 28, 2014 at 7:44pm.

1. What is the probability of having exactly one class that gives homework?

Is this a nCx problem?

I got an illogical answer: 10.54=1054% THIS IS NOT RIGHT!!!!!!!

2. What is the probability of having homework in at least 1 class?

My answer : 0.492

- Math:Probability -
**Reiny**, Friday, February 28, 2014 at 9:25pm1.

could be 1 in math or 1 in history or 1 in Spanish

that is (math)(no history)(no Spanish) + ....

prob = .9(.4)(.25) + .6(.1)(.25) + .25(.1)(.4)

= .115

Exclude the case of no homework in any

which is (.1)(.4)(.25) = .01

prob(homework in at least 1 class) 1 - .01 = .99

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