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Normal Probability: Synthetic rubber

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(TCO 6) The time required to make 1000 gallons of synthetic rubber at a plant in South America in a recent year was normally distributed with a mean of 18 hours and a standard deviation of 2.5 hours. What is the probability that it will take more than 21 hours to make 1000 gallons of synthetic rubber?

1.2
0.1151
0.8849
0.9772

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The solution provides answer to a multiple choice question on normal probability. Working is also included.

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