答案和详解如下： Q6. If event A and event B cannot occur simultaneously, then events A and B are said to be:
A) statistically independent.
B) collectively exhaustive.
C) mutually exclusive.
Correct answer is C) If two events cannot occur together, the events are mutually exclusive. A good example is a coin flip: heads AND tails cannot occur on the same flip.
Q7. In any given year, the chance of a good year is 40%, an average year is 35%, and the chance of a bad year is 25%. What is the probability of having two good years in a row? A) 16.00%. B) 10.00%. C) 8.75%. Correct answer is A) The joint probability of independent events is obtained by multiplying the probabilities of the individual events together: (0.40) × (0.40) = 0.16 or 16%. | 
发表于 2009-1-9 08:54
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