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The birth weights for twins are normally distributed with a mean of 2353 grams and a standard deviation of 647 grams. use z-scores to determine which birth weight could be considered unusual.

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BlueSky06
Z-scores allow us to determine how far from the mean value is the data point given. It is usually considered an "unusual value" if the data has a z-score of that has an absolute value greater than 2. Z-scores are calculated through the following equation,
                           z-score = (data point - mean) / standard deviation

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