Question 841690
Q:
A medical laboratory receives 30 blood specimens to check for HIV. Seven actually contain HIV. A worker is accidentally exposed to five specimens. What is the probability that none contained HIV?
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A:
probability = {{{(matrix(2,1,7,0))(matrix(2,1,23,5))/((matrix(2,1,30,5)))}}} = {{{highlight(0.2361)}}}