The probability that a new ballpoint pen writes poorly (or does not write) is 0.11. A customer in a store chooses one ballpoint pen. Find the probability that this pen writes well.
The sum of the probabilities of all possible events is 1. We have only two possible events: the pen writes poorly, the pen writes well. This means that the probabilities of these two events add up to 1:
P (pen writes well) + P (pen writes poorly) = 1
P (pen writes well) = 1 – P (pen writes poorly) = 1 – 0.11 = 0.89
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