please help quick questions

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1

probability questions.

1)Your friend answers correctly 90% of the trivia questions you ask him. If you ask him 3 questions, what is the probability he gets AT LEAST ONE CORRECT? ASSUME INDEPENDENCE

2)Same friend, still 90% correct. If you ask him 4 questions, what is the probability he gets AT LEAST ONE WRONG? ASSUME INDEPENDENCE Note: 4 questions, this time and at least one WRONG this time!

3.) You have a second friend who gets 80% of the answers correct. (again, assume independence). If you ask a question to EACH of the two friends, what is the probability AT LEAST ONE answers INCORRECTLY?
…

2

how to do it would be helpfull too… i havent taken a stats class in like 4 years

3

do your own homework.

4

MTH411 sucked balls and I forgot most of it immediately upon completing the final. Google is your best friend.

5

If i had time or cared, i would do those, but i dont have to take math til next year, too bad since im good at probability

6

http://www.peterwebb.co.uk/probability.htm

That should help a bit.

7

TT ONE LAST TIME… JUST TO CHECK MY ANSWERS…