Doctors

The drug successfully treats 90% of cases. Calculate the probability that it will cure at least 18 patients out of 20.

Correct answer:

P =  67.6927 %

Step-by-step explanation:

p=90%=10090=109=0.9  p18=(1820)p18(1p)2018=(1820)0.918(10.9)2018=1900.9180.120.2852  p19=(1920)p19(1p)2019=(1920)0.919(10.9)2019=200.9190.110.2702  p20=(2020)p20(1p)2020=(2020)0.920(10.9)2020=10.9200.100.1216  P=100 (p18+p19+p20)=100 (0.2852+0.2702+0.1216)=67.6927%



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