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After the 10 March 2011 update to the Current Impact Risks page, the 363 listed Cumulative Impact Probabilities were imported into a spreadsheet [ Open Office Calc ] and added*. The sum was 7.54E-02 [in "scientific notation"], which represents the probability (one in 13) of impact by one or more of the 363 listed objects over the next hundred years. |
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* students of Statistics will note that the addition of event probabilities is merely 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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