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In a test of a gender-selection technique, results consisted of 254 baby girls

In a test of a gender-selection technique, results consisted of 254 baby girls In a test of a gender-selection technique, results consisted of 254 baby girls and 15 baby boys. Based on this result, what is the probabiilty of a girl born to a couple using this technique? Does it appear that the technique is effective in increaing the likelihood that a baby will be a girl?

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