Internet sites often vanish or move, so that references to them can\'t be follow

Question

Internet sites often vanish or move, so that references to them can't be followed. Suppose 16% of Internet sites referenced in major scientific journals are lost within two years after publication. If a paper contains seven Internet references, what is the probability that all seven are still good two years later? (Round your answer to four decimal places.) What specific assumptions did you make to calculate this probability? It is assumed that each site is independent of the others. It is assumed that each site is not independent of the others eBook

Explanation / Answer

P=0.16

q=0.84

P(all 7 reference are good two year)

=7c0 *(0.16)^0 *(0.84)^7

=0.2951

(Assume that there are two possible outcome i.e.reference is lost or still good.reference lost or not lost both independent.

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