prob. of guessing the correct ans. is x/12. if prob of not guessing the correct ans is 2/3 . find x.

Asked by  | 23rd May, 2009, 12:16: PM

Expert Answer:

Let E be the event of guessing the correct answer and E' be the event of not guessing the correct answer

Prob. of guessing the correct ans. is x/12

P(E) = x/12 
P(E') = 2/3 = 1- x/12

x/12 = 1-2/3 = 1/3 
x = 4

Answered by  | 23rd May, 2009, 12:28: PM

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