Thread: 2 Binomial Probability Questions
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Old June 7th, 2009, 08:36 AM
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At least 2 means X is 2 or 3 or 4 or... 10. Here you want P(X\ge 2).

Fewer than 2 means X is 0 or 1. Here you want P(X < 2)=P(X\le 1).

Note that P(X\ge 2)+P(X\le 1)=1.

And it's n-r, not r-1.
Last edited by matheagle; June 7th, 2009 at 08:47 AM.
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