Question: In a certain third world nation, statistics show that only two out of ten children born in the early 1980s reached the age of twenty-one.

In a certain third world nation, statistics show that only two out of ten children born in the early 1980s reached the age of twenty-one. If the same mortality rate is operative over the next generation, how many children does a woman need to bear if she wants to have at least a 75% probability that at least one of her offspring survives to adulthood?

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