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February 28, 2015

February 28, 2015

Posted by **Tony** on Wednesday, June 8, 2011 at 7:56pm.

- Elementary Statistics -
**Reiny**, Wednesday, June 8, 2011 at 8:21pmThe machine will be working if

1. no part fails ---> (.8)^7

2. 1 part fails ----> C(7,1)(.2)(.8)^6

3. 2 parts fail ---> C(7,2)(.2^2)(.8^5)

4. 3 parts fail ---> C(7,3)(.2^3)(.8^4)

add them up

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