Question

Tire pressure in a certain car is a normally distributed random variable with mean 30 psi (pounds per square inch) and standard deviation 2 psi. The manufacturer's recommended correct inflation range is 28 psi to 32 psi. A motorist's tire is inspected at random.
(a) What is the probability that the tire's inflation is within the recommended range?
(b) What is the probability that the tire is underinflated?
*(c) A company has developed a microchip that will warn when a tire is 25 percent below the recommended mean, to warn of dangerously low tire pressure. How often would such an alarm be triggered?


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  • CreatedAugust 19, 2015
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