Results of a 1996 American Medical Association report about the infant mortality rate for twins carried for the full term of a normal pregnancy are shown on the next page, broken down by the level of prenatal care the mother had received.

a) Is the overall rate the average of the other three rates? Should it be?
b) Do these results indicate that adequate prenatal care is important for pregnant women?
c) Do these results suggest that a woman pregnant with twins should be wary of seeking too much medical care? 

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Full-Term Pregnancies, Level of Prenatal Care Intensive Adequate Inadequate Overall Infant Mortality Rate Among Twins (deaths per thousand live births) 5.4 3.9 6.1 5.1