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scan0043 - (3 f 5 ’ r ~ 1 3 A medical investigator is...

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Unformatted text preview: (3'? f 5, % ’ r ~, 1 3. A medical investigator is studying two drugs identical in appearance numb fled 1 or 2; When the drugs are injected in guinea pigs the probabilities that an antitoxin Will develop are 1/4 for number 1 and 1/3 for number 2, There are two bottles of number 1 and three bottles of number 2. The investigator, in hurrying to give a demonstration of these drugs, takes one bottle without noting its number. In transit the label is torn off (a) \Vhat is the probability that the selected bottle is number 1? :: \§ 1,: , .» /§* (b) What is the probability that the selected bottle is number 2‘? . r v_._ 4 WV ‘ ’7/5 , \ \v ‘x, (c) What is the probability that no antitoxin forms for number 1'? “V“: {3 ”‘1‘ \ ,« i ‘ w it; {l \llx‘} (d) What is the probability that no antitoxin forms for number 2? '2. " \ m, :15" 2 ,y g i Z 1 10‘1" g’Ql 1 t ' , {i 2) l 3 ,1? (c) When a guinea pig is injected with this drug, no antitoxin forms. What is the probability that it was drug number 27 hint: P(A)P(F§ A) P A B‘ - x < l ) P(A)P(B[A) + P(ACJP(B|AC) (if? e? s» x: I,» is? I): / ...
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