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Thank you!The shape of the distribution of the time required to get an oil change at a 20 minute oil change facility is unknown. Howeve

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M=21.4, 3.5 2-3-4 ~N10,1) P(<20 ) Plz< 20 - 21.4 3.5 = P(Z < -2.3664) NORMS-DIST (-2.3664) -> Excel Juz 0.0090 این Plzc X-211

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