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Required probability = P(z < - 3.13 or z > 3.13) = P(z < - 3.13) + P(z > 3.13) The required probability is the area under the standard normal curve lying in the extreme left tail and in the extreme right tail. = 0.0049 (area left to z = - 3.13) + 0.0049 (area right to z = 3.13) = 0.0098

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