you might want to look at my answer to Belinda, 5 posts back
Her problem and yours are the same style
For your question you have to divide 13 by 12 to get the weight of one egg.
The weights of extra large eggs have a normal distribution with a mean of one ounce and a standard deviation of 0.1 ounces. The probability that a dozen eggs weighs more than 13 ounces is closest to...?
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