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The voltage held by a voltage regulator follows a normal random variable with a mean that equals 200 volts and a standard deviation that equals

The voltage held by a voltage regulator follows a normal random variable with a mean that equals 200 volts and a standard deviation that equals 5 volts. A regulator meets the specifications if the regulator can hold a voltage between 185 and 210 volts. What fraction of the regulators meet the specifications?

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