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A random sample of 225 observations were selected from a population with a mean ?...

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A random sample of 225 observations were selected from a population with a mean ? = 20 and variance ?2 = 144.Find mean and standard deviation of the sampling distribution of the sample mean.mean = 20, s.d. = 12mean = 20, s.d. = 0.64mean = 0.9, s.d. = 0.8mean = 20, s.d. = 0.8mean = 0.9, s.d. = 12

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