is it the same as calculating P(X>=3)??

thanks!

- Oct 11th 2007, 06:07 PMbeetzbinomial distrib-how to calculate P(X>3 given n=15, success=.40)?
is it the same as calculating P(X>=3)??

thanks! - Oct 11th 2007, 07:48 PMJhevon
- Oct 11th 2007, 09:33 PMbeetz
how would i do that with the calculator....

would that be 1-binomcdf(15,.40,2)? - Oct 11th 2007, 09:55 PMJhevon
it depends on the calculator. but recall that this is actually what you're doing:

the probability of successes in trials is given by:

where is the probability of success, and is the probability of failure.

here, p = 0.4, and q = 0.6 and n = 15

so you want:

now, on my calculator, there is a button. so to find say, i would enter, "15, , 2 = "

but these are easy enough to work by hand if you're not sure about your calculator.