How do I answer question 5 With work Preterm under 37 weeks

Preterm = under 37 weeks Low birth weight a under 5.5 pounds 14 12 10 - Percent of preterm births Percent of low birth weights 1990 1992 1994 1996 1998 2000 2002 Birth Weights in America Gestation period Mean birth Standard deviation The National Center for Health Statistics (NCHS) keeps records of many health-related aspects of people, including the birth weights of all babies born in the United States weight 188 tb 4.08 b 1.20 lb 1.85 1b Under 28 Weeks The birth weight of a baby is related to its gestation period 28 to 31 Weeks (the time between conception and birth). For a given gestation period, the birth weights can be approximated by a normal distribution. The means and standard deviations of the birth 36 Weeks weights for various gestation periods are shown at the right. 1 I s7ilb 644 lb 1.471b 1.19 tb 32 to 35 Weeks 7.31 lb 7.69 1b 7.79 1b 1.09 lb 1.04 lb 1.08 tb to 39 Weeks One of the many goals of the NCHS is to reduce the percentage 40 Weeks of babies born with low birth weights As you can see from the graph at the upper right, the problem of low birth weights increased from 1990 to 2004 1 Wocks 1 Weeks 1.11 n 42 Wecks and over 7.61 Exercises period have a low birth weight (under 5.5 pounds)? Explain your reasoning (a) Under 28 weeks (b) 32 to 35 weeks (c) 37 to 39 weeks I. The distributions of birth weights for three gestation 2. What percent of the babies horn within each periods are shown. Match the curves with the gestation periods. Explain your reasoning (d) 42 wecks and over 3. 3, Describe the weights of the top 10% of the babies born with each gestation period. Explain your reasoning (a) 37 to 39 weeks (b) 42 weeks and over 4. For each gestation period, what is the probability that a baby will weigh between 6 and 9 pounds at birth? (a) 32 to 35 weeks (c) 42 weeks and over (by (b) 37 to 39 weeks 5. A birth weight of less than 3.3 pounds is classified by the NCHS as a \"very low birth weight.\" What is the probability that a baby has a very low birth weight (cy for each gestation period? (a) Under 28 weeks(b) 32 to 35 weeks (c) 37 to 39 weeks 269

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