In the United States, the mean birth weight for boys is 3.41 kg, with a standard deviation of 0.55 kg. Assume that the distribution of birth weight is approximately normal and define low birth weight as a newborn baby weighing less than 2.5 kg. What proportion of baby boys in the United States are born with low birth weight? 0.7157 0.2843 0.5718 0.9505 0.0495

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