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the average newborn baby weighs 7.7lbs with standard deviation of approximately 0.5lbs. if this is normal distribution then what percentage of babies would be at least 6.7lbs.

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HomertheGenius
We know that the Mean ( or the average ) is 7.7 lbs.The standard deviation :  SD = 0.5 lbs.7.7 - 2 * 0.5 = 7.7 - 1 = 6.7 lbsIt means that 6.7 lbs is The Mean - 2 Standard deviations.According to the bell - shaped curve of Normal distribution:50 % + 34 % + 13.5 % = 97.5 %Answer: 97.5 % of babies would be at least 6.7 lbs.

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