A medical device company knows that 11 percent of patients experience injection-site reactions with the current needle. If 3 people receive injections with this type of needle, what is the probability that the first person has an injection-site reaction, but the next two do not?

The probability of a reaction for the first person is 0.11. Each of the next two people has a 0.89 probability of not having a reaction, so multiply the independent probabilities: 0.11 × 0.89 × 0.89 = 0.087131, which rounds to 0.0871. This matches choice D, 0.0871.

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