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    How to find sample variance given population mean and variance (no specific data)

    Hi, I am working on the following problem:confused:: Population Mean = 1000 Population Std. Dev. = 400 Sample N=25 How many, from the sample of 25, are greater than 1000 if the sample mean is 1100. Can I assume the sample std. dev. is the same as the population? Does anyone know...