SOLUTION: ​27 % adults favor the use of unmanned drones by police agencies. Twelve U.S. adults are randomly selected. Find the probability that the number of U.S. adults who favor the use

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Question 1171465: ​27 % adults favor the use of unmanned drones by police agencies. Twelve U.S. adults are randomly selected. Find the probability that the number of U.S. adults who favor the use of unmanned drones by police agencies is​ (a) exactly​ three, (b) at least​ four, (c) less than eight.
​(a) P(3)=
Answer by Boreal(15235) About Me  (Show Source):
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a is 12C3(0.27)^3*(0.73^9)=0.2549
b at least 4 look at 3 or fewer, that is 2ndVARSbinomcdf(12,0.27,3)=0.5863; at least 4 is the complement or 04137.
c fewer than 8 is the same with the argument (12,0.27,7)=0.9953