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January 31, 2015

January 31, 2015

Posted by **HM** on Wednesday, November 9, 2011 at 4:18am.

Could some one please help me?

And explain to me how they got the answer?

and is there another way besides the tree method?

- PROBABILITY MATH -
**Reiny**, Wednesday, November 9, 2011 at 8:08amAll we have to exclude is the case when he guessed all of them wrong

that prob would be (1/2)^10 = 1/1024

so the prob of getting at least one correct is 1 - 1/1024 = 1023/1024

- PROBABILITY MATH -
**ebony**, Monday, May 14, 2012 at 12:28amTake 10/2=5

possibility of 5 right or 5 wrong because there is only two possible outcomes

2/100 = .50 (True and False Outcomes)

There are a total of 10 questions

.50^10 questions = .0009765625 rounded = .0009777

use the complement formula 1-P=

1-.0009777 = .9990223 that there is at least once correct answer

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