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Baby weights: The weight of male babies less than 2 months old in the United States is normally distributed with mean 12.3 pounds and standard deviation 4.7 pounds. Use Excel to answer the following. Round the answers to four decimal places. Part 1 of 4 (a) What proportion of babies weigh more than 12 pounds? The proportion of babies weighing more than 12 pounds is .5255 Part 2 of 4 (b) What proportion of babies weigh less than 15 pounds? The proportion of babies weighing less than 15 pounds is .7171 Part: 2 / 4 Part 3 of 4 (c) What proportion of babies weigh between 9 and 13 pounds? The proportion of babies weighing between 9 and 13 pounds is X