test with 10 multiple choice questions, five possible answers; one is correct. Pass is 60% or better If he randomly guesses, what is probability he will pass

Use the binomial probability. There are 5 guesses so the probability of guessing right is .20
But 6 or more must be correct to pass.
So, we have a binomial asking what is the probability of getting 6 or more correct.

\sum_{6}^{10}C(10,k)(.2)^{k}(.8)^{10-k}

You made this seem so easy but for the life of me I could not figure out what formula to use... thank you SO much for helping me!!

So, to pass, the probability is 0.205?

Are you referring to the answer in this thread. If so, then you have to post with the same thread, not as a separate question:

https://www.askmehelpdesk.com/mathematics/probability-443977.html

Tick

So, to pass, the probability is 0.205?

Did I submit in the correct thread this time?

Well not really, since you did not ask a math question. If you want help with how to post, that would be done in the forum help area.

This is the area to post math questions.

Hi, nmarl001!

Yes, please post responses on the original thread. This place doesn't work the same way that a chat room does.

Thanks!

Put this on your original post. Yes, the person who responded might find this and know what you're referring to and be able to find the thread. Or maybe not. Your original post could end up anywhere with people having no idea what you're referring to.