39% 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.
Let X denotes the number of U.S. adults who favor the use of unmanned drones by police agencies out of randomly selected 12 U.S. adults.
X ~ Binomial(n = 12, p = 0.39)
The probability mass function of X is
Now,
a) The probability that the number of U.S. adults who favor the use of unmanned drones by police agencies is exactly three
b) The probability that the number of U.S. adults who favor the use of unmanned drones by police agencies is at least four
c) The probability that the number of U.S. adults who favor the use of unmanned drones by police agencies is less than eight
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