Thread: Simple probability question

Hi There's a 15% chance to get a blue.

I've got 3 chances to hit blues. What's the chance I hit exactly 2/3 blues?

Originally Posted by VII

Hi There's a 15% chance to get a blue.
I've got 3 chances to hit blues. What's the chance I hit exactly 2/3 blues?

Please rewrite your question in much more complete details.
As written, it is too vague to answer.

There's some sweets in a bag. There's a 15% chance to get a blue sweet.
I will take a sweet out, and put it back in.
If take a sweet out and put it back 3 times, what's the chance 2/3 of those sweets will be blue?

Originally Posted by VII

There's some sweets in a bag. There's a 15% chance to get a blue sweet. I will take a sweet out, and put it back in.
If take a sweet out and put it back 3 times, what's the chance 2/3 of those sweets will be blue?

Simple binomial probability:

I don't understand that >.>
What's the % chance of getting 2/3 blues?

Originally Posted by VII

I don't understand that >.>
What's the % chance of getting 2/3 blues?

Reply #4 contains the exact answer.
It is your job to do the calculation. This is not a homework service.

If you do not understand how to evaluate a binomial coefficient, then you have no business trying this problem.