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QD Corporation makes paints known for their quality and quick drying features. QD has developed a...

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Basic Math

  1. QD Corporation makes paints known for their quality and quickdrying features. QD has developed a new wall paint code namedMickey that it is testing in a controlled environment. The firm istesting for drying time of the paint. Drying time is affected byfactors like humidity, air pollution, ventilation and temperature.The test results show that the drying time of Mickey is normallydistributed with a mean of 10 hours and a standard deviation of 1.8hours.

Compute the following:

  1. What is the probability that the drying time is less than 7hours?
  2. What is the probability that the drying time is between 6 hoursand 12 hours?
  3. What should the label on the paint can say if the firm wants tobe 95% sure that the drying time will be the claimed time orless?
  4. A customer returns a can saying that the drying time was 15hours. What is the z score correspondingto that observed value?

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