# please help quick questions

**URL:** <https://forums.speedlife.net/t/please-help-quick-questions/8643>\
**Category:** NYSpeed Off Topic\
**Created:** [February 26, 2006, 9:54pm UTC](https://forums.speedlife.net/t/please-help-quick-questions/8643 "2006-02-26T21:54:12Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Willybeen](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/willybeen/32/7351_2.png) [@Willybeen](https://forums.speedlife.net/u/Willybeen)\
**Post date:** [February 26, 2006, 9:54pm UTC](https://forums.speedlife.net/t/please-help-quick-questions/8643/1 "2006-02-26T21:54:12Z")

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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?  
…

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**Author:** ![Willybeen](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/willybeen/32/7351_2.png) [@Willybeen](https://forums.speedlife.net/u/Willybeen)\
**Post date:** [February 26, 2006, 10:09pm UTC](https://forums.speedlife.net/t/please-help-quick-questions/8643/2 "2006-02-26T22:09:34Z")

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

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**Author:** ![Jam](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jam/32/7235_2.png) [@Jam](https://forums.speedlife.net/u/Jam)\
**Post date:** [February 26, 2006, 11:16pm UTC](https://forums.speedlife.net/t/please-help-quick-questions/8643/3 "2006-02-26T23:16:25Z")

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do your own homework.

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**Author:** ![sureshot007](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sureshot007/32/7345_2.png) [@sureshot007](https://forums.speedlife.net/u/sureshot007)\
**Post date:** [February 27, 2006, 6:00am UTC](https://forums.speedlife.net/t/please-help-quick-questions/8643/4 "2006-02-27T06:00:17Z")

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

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**Author:** ![The\_Russian](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/the_russian/32/7414_2.png) [@The\_Russian](https://forums.speedlife.net/u/The_Russian)\
**Post date:** [February 27, 2006, 6:04am UTC](https://forums.speedlife.net/t/please-help-quick-questions/8643/5 "2006-02-27T06:04:16Z")

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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

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**Author:** ![sureshot007](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sureshot007/32/7345_2.png) [@sureshot007](https://forums.speedlife.net/u/sureshot007)\
**Post date:** [February 27, 2006, 7:09am UTC](https://forums.speedlife.net/t/please-help-quick-questions/8643/6 "2006-02-27T07:09:39Z")

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[http://www.peterwebb.co.uk/probability.htm](http://www.peterwebb.co.uk/probability.htm)

That should help a bit.

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**Author:** ![Willybeen](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/willybeen/32/7351_2.png) [@Willybeen](https://forums.speedlife.net/u/Willybeen)\
**Post date:** [March 4, 2006, 1:05pm UTC](https://forums.speedlife.net/t/please-help-quick-questions/8643/7 "2006-03-04T13:05:01Z")

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TT ONE LAST TIME… JUST TO CHECK MY ANSWERS…