Baby weights: The weight of male babies less than 2 months old in the United States is normally distributed with mean 12.2 pounds and standard deviation 4.5 pounds. (a) Find the 86th percentile of the baby weights. (b) Find the 15th percentile of the baby weights. (c) Find the third quartile of the baby weights. Use the TI-84 Plus calculator and round the answers to at least two decimal places. Part 1 of 3 The 86th percentile of the baby weights is pounds. Part 2 of 3 The 15th percentile of the baby weights is pounds. Part 3 of 3 The third quartile of the baby weights is pounds.
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The z-score for the 6th percentile is -1.55 (you can find this in a standard z-table or use the TI-84 Plus calculator's invNorm function). So, the 6th percentile is 12.2 + (-1.55)*4.5 = 5.25 pounds. Part 2 of 3: The 15th percentile of the baby weights is Show more…
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