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Research has indicated that for every 1000 births, 23 of them are fraternal twins. I have reason to believe the occurrences of fraternal twins to

Research has indicated that for every 1000 births, 23 of them are fraternal twins. I have reason to believe the occurrences of fraternal twins to be higher in a certain area of southeastern Australia. Researchers examine the records of 345 births and find that 12 of the births are fraternal twins. What is p hat

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