Hi ,

I am struggling with these two question . Any help would be appreciated ,Im
looking at doing them on r ?

1. Tests for indications of asbestos in the lungs of employees at an
insulation manufacturer resulted in four persons with positive indications
of asbestos being sent to a medical center for further testing . if 45% of
the employees have positive indications of asbestos in their lungs , find
the probability that twelve employees must be tested in order to find the
four positives to send for further testing ?

2. In a small scale trial five seeds are treated with fungicide and five
seeds are untreated with fungicide. Seeds were then planted and the number
was counted . If four plants actually sprouted what is the probability that

a) all four plants emerged form the treated seeds.
b)Three of few emerged from the treated seeds

Regards

Malcolm

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