The probability that a Firestone tire is defective is equal to 0.0004. The probability that it is not defective is equal to 1 - 0.0004 = 0.9996

If 120 tires are bought by the retail store the probability that at least one is defective is equal to 1 - (probability...

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The probability that a Firestone tire is defective is equal to 0.0004. The probability that it is not defective is equal to 1 - 0.0004 = 0.9996

If 120 tires are bought by the retail store the probability that at least one is defective is equal to 1 - (probability that none of them are defective) = 1 - 0.9996^120 = 0.0468

**There is a 0.0468 probability that at least one of the tires bought is defective.**