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4. Suppose oysters contain pearls with a diameter in millimetres (m) that follows a uniform distribution on (0, b). The variance of the diameters is

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4. Suppose oysters contain pearls with a diameter in millimetres (m) that follows a uniform distribution on (0, b). The variance of the diameters is 12. What is the probability that an oyster contains a pearl with a diameter of at least 4 mm? (A) 67% (B) 50% (C) 33% (D) Cannot be determined

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