Question

Birth Weights in America 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 The birth weight of a baby is related to its gestation period (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 weights for various gestation periods are shown in the table below One of the many goals of the NCHS is to reduce the percentage of babies born with low birth weights As you can see from the graph below, the problem of low birth weights increased from 1992 to 2006 Mean birth Standard 16 weightdeviation 1.90 lb 4.12 Ib 5.14 Ib 6.19 Ib 7.29 Ib 7.66 Ib under 37 wocks Low birth weight-under 5.5 pounds Under 28 weeks 28 to 31 weeks 32to33 weeks 34 to 36 weeks 7 to 39 wecks 40 wecks 41 weeks 2 weeks and over 1.22 Ib 187 lb 157 Ib 1.29 Ib 1.08 Ib 104 Ib 1.07 lb 1.11 lb 12 Percent of preterm births Percent of low birth weights 992 1994 199% 998 2000 2002 004 200 7.57 Ib EXERCISES 1. The distributions of birth weights for three 2 What percent of the babies born within each gestation periods are shown. Match the curves with the gestation periods. Explain your reasoning gestation period have a low birth weight (under 5.5 pounds)? Explain your reasoning (a) Under 28 weeks (b) 32 to 33 weeks (c) 40 weeks (d) 42 weeks and over 3, Describe the weights of the top 10% of the babies born within each gestation period. Explain your reasoning 910 (a) Under 28 weeks (b) 34 to 36 weeks (c) 41 weeks Pounds (d) 42 weeks and over For each gestation period, what is the proba- bility that a baby will weigh between 6 and 9 pounds at birth? (a) Under 28 weeks (b) 28 to 31 weeks (c) 34 to 36 weeks (d) 37 to 39 weeks 10 Pounds . A birth weight of less than 3.25 pounds is classified by the NCHS as a "very low birth weight. What is the probability that a has a very low birth weight for each gestation period? 89 Pounds I (a) Under 28 weeks (b) 28 to 31 weeks (c) 32 to 33 weeks (d) 37 to 39 weeks

please answer question 4 and 5

Answer 1