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jesusfreak
Krissy has 3 arrows. The probability of her hitting the target is 2/5. What is the probability that she will get at least one arrow on the target?
At least one means she does not miss all, which is easier to calculate. Probability of missing all three is P(0)=(3/5)^3 so P(1+)=1-P(0)
What would the answer be in percent?
P(0)=(3/5)^3= 0.216 so P(1+)=1-P(0)=0.784