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Predicting the gender of babies

Assignment:

Question 1. Marie claims she can predict the sex of pregnant women's babies. She sees 1,000 women a year, and she always predicts a female. She charges $1,000 for a prediction, and she always predicts a female (although clients do not know that). When she is wrong, she offers a double-your-money back guarantee. Since the chance of having a female is approximately 50%, how can she earn any money?

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Basic Statistics: Predicting the gender of babies

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