There are 5 trials each with success probability of 0.02. The probab of winning only at the 3rd AND 5th trial is 0.02^2 * 0.98^3.
What if I am asked the prob of winning at the 3rd OR at the 5th trial?
How do I do it? And why?
The probability of winning when playing one game on the slot machine is 2%. Mr Brown tries 5 times(assume independently). What is the probability of winning only at the third and the fifth trials?
That is the exercice and in class we solved it like this: 0.02^2* 0.98^3.
In class we never seen the "OR" and I was wondering what I am supposed to do if at the exam they put me an exercice with "Or" istead of "and". Can you help me? Can you explaining me what all your questions mean? I mean can you let me see how they are different? Thank you so so much.
But you really need to discuss this with your instructor. Find out her/his take on the language of this question.
well I was just trying to figure out what to do in case I find an "OR" somewhere. We are not supposed to hae the same exercices we did in class. They are usually things we have never seen before, that is why I was wondering about the or.
So to wrap up: if I find something that appears to mean "3rd(let's say) or 5th but not both" I compute the prob of getting ONLY the 3rd as success just thinking the others are all failures. do the same with the 5th and sum them.
If I find "3rd or 5th or both" the same as before plus the probab of having exacltly those two successes.
Is this right? Are there any other cases I might find? Might you please let me see how to answer the questions you posed, I have no idea where to start?
Thanks a lot