Thread: Simple Probability Problem

I have a simple probability problem I can't get for the life of me must be over thinking it.

It is said that 40% of students drink coffee in the morning before class. If a group of 25 students were polled, what is the probability of 15 of them drinking coffee?

Any help would be appreciated thanks

Originally Posted by action259

I have a simple probability problem I can't get for the life of me must be over thinking it.

It is said that 40% of students drink coffee in the morning before class. If a group of 25 students were polled, what is the probability of 15 of them drinking coffee?

Any help would be appreciated thanks

I think this involves Binomial distribution. have you ever heard of it?

Originally Posted by action259

I have a simple probability problem I can't get for the life of me must be over thinking it.

It is said that 40% of students drink coffee in the morning before class. If a group of 25 students were polled, what is the probability of 15 of them drinking coffee?

Any help would be appreciated thanks

% right...

We have students in total...

Define a success as "A student drinks coffee."

Then,

number of students that drink coffee the number successes with ~

Also, we know the probability mass function is:

Therefore,

Now throw that in your calculator.

Ok that makes sense Thanks