Distribution of daily price, Basic Statistics

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Distribution of daily price

Past data point to that the distribution of daily price/earnings ratio of a national health and medical services can be approximated by a normal distribution with a standard deviation of 4.123. How large a sample would be necessary to estimate the mean price/earnings ratio of the national health and medical services to be within 2 units of a 98% confidence?

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Basic Statistics: Distribution of daily price

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