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After the 21 March 2008 update to the Current Impact Risks page, the 180 listed Cumulative Impact Probabilities were imported into a spreadsheet [ Open Office Calc ]
and added*. The sum was 1.19E-02 [in "scientific notation"], which represents the probability (one in 84) of impact by one or more of the 180 listed objects between AD2008 and AD2108.
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* students of Statistics will note that the addition of event probabilities is only an approximate method of estimating the probability of occurrence of at least one event, but also that the resulting error is small enough to be negligible where [as in this case] the sum of the probabilities is small.
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