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4. [15 Points] Vehicle speed in the State Route 99 Tunnel in Downtown Seattle follows a normal distribution. (a) If the mean and standard deviations
4. [15 Points] Vehicle speed in the State Route 99 Tunnel in Downtown Seattle follows a normal distribution. (a) If the mean and standard deviations are 50 m/h and 10 m/h, respectively, what percent of vehicles have a speed between 45 m/h and 65 m/h? Solution. Z ~ N(50, 10). Then P(45
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