The average age of a vehicle registered in the United States is 11.8 years or 142 months. assume the standard deviation

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answerhappygod
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The average age of a vehicle registered in the United States is 11.8 years or 142 months. assume the standard deviation

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The average age of a vehicle registered in the United States is 11.8 years or 142 months. assume the standard deviation is 45 months. if a random sample of a group of 40 vehicles is selected find the probability that the sample mean of the groups age is between 135 months and 157 months
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