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Gestation Period Mean Birth Weight Standard Deviation

Under 28 weeks 1.88 lb 1.19 lb
28 to 31 weeks 4.07 lb 1.87 lb
32 to 35 weeks 5.73 lb 1.48 lb
36 weeks 6.46 lb 1.20 lb
37 to 39 weeks 7.33 lb 1.09 lb
40 weeks 7.72 lb 1.05 lb
41 weeks 7.83 lb 1.08 lb
42 weeks and over 7.65 lb 1.12 lb

There are 5 exercises

Question 1) The distributions of birth weights for three gestation periods are shown. Match the curves with the gestation periods. Explain your reasoning.

Question 2) What percent of the babies born with each gestation 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 (d) 42 weeks and over.

Question 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

Question 4) For each gestation period, what is the probability that a baby will weigh between 6 & 9 pounds at birth?
(a) 32 to 35 weeks (b) 37 to 39 weeks (c) 42 weeks and over

Question 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 for each gestation period?
(a) Under 28 weeks (b) 32 to 35 weeks (c) 37 to 39 weeks

[Curlyben]

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