one quesion form November 2001.

A company takes out insurance policy to cover accidents that occur at its manufacturing plant. The prob. that one or more accidents will occur during any given month is 3/5. The number of accidents that occur in any given month is independent of the number of accidents that occur in all other months.

Calculate the probability that there will be at least four months in which no accidents occur before the fourth month is which at least one accident occurs.

I don't understand the question. thanks for help

A company takes out insurance policy to cover accidents that occur at its manufacturing plant. The prob. that one or more accidents will occur during any given month is 3/5. The number of accidents that occur in any given month is independent of the number of accidents that occur in all other months.

Calculate the probability that there will be at least four months in which no accidents occur before the fourth month is which at least one accident occurs.

I don't understand the question. thanks for help

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