[問題] 機率問題
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A company takes out an insurance policy to cover accidents that occur at its
manufacturing plant. The probability that one or more accidents will occur
during any given month is 0.60. The numbers of accidents that occur in different months
are mutually independent.
Calculate the probability that there will be at least four months in which no
accidents occur before the fourth month in which at least one accident occurs.
解答是算
in the first seven months there must be at least four with no accidents
為何是7個月阿? 題目內好像也沒有提到
謝謝
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