A medical device company knows that 12% of patients experience injection-site reactions with the current needle. If 6 people receive injections with this type of needle, what is the probability that at least one of them has an injection-site reaction?

It is easier to find the probability that none of the 6 patients has a reaction, then subtract from 1. Each patient has an 88% chance of no reaction, so the probability that all 6 have no reaction is 0.88⁶ ≈ 0.4644. Therefore, the probability that at least one has a reaction is 1 − 0.4644 = 0.5356, choice C.

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