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Refer to the accompanying technology display. The probabilities were obtained by entering the values of n= 5 and p= 0.763. In a clinical test of a? drug, 76.3?% of the subjects treated with 10 mg of the drug experienced headaches. In each? case, assume that 5 subjects are randomly selected and treated with 10 mg of the drug. Find the probability that at least four of the subjects experience headaches. Is it unusual to have fewer than four subjects experience? headaches?
The probability that at least four of the subjects experience headaches is ???
*Round to four decimal
x P(X=x)
0.00 0.0007
1.00 0.0120
2.00 0.0775
3.00 0.2495
4.00 0.4016
5.00 0.2586
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