Kombinatorikk
Posted: 11/05-2009 16:45
Sitter og repeterer pensum, og så finner jeg ut at jeg ikke tenker riktig, for jeg klarer ikke å få fasitsvaret på oppgave d) under:
Litt flaut, for jeg synes oppgaveteksten virker så simpel. Fasitsvaret er .0235.Shortly after being put into service, some buses manufactured by a cartain company have developed cracks on the underside of the main frame. Suppose a particular city has 25 of these buses, and cracks have actually appereared in 8 of them.
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d) If a sample of 5 buses are chosen at random, what is the probability that at least 4 of those selected will have visible cracks?