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A survey for a certain year found that 90% of pregnant women received medical care at least once before giving birth. Of these women, 60% received medical care from doctors, while 40% received medical care from other healthcare providers. Given this information, which one of the following statements can be inferred with certainty?

1. More than half of the pregnant women received medical care at least once from a doctor.
2. Less than half of the pregnant women received medical care at least once from a doctor.
3. More than half of the pregnant women received medical care at most once from a doctor.
4. Less than half of the pregnant women received medical care at most once from a doctor.

Correct answer: More than half of the pregnant women received medical care at least once from a doctor.

Solution

Since 90% of pregnant women received medical care and 60% of those received it from doctors, this means that 54% of all pregnant women received care from doctors, which is indeed more than half.

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