Mathematics, 23.09.2019 16:30 1230bering

Sarah is twice as old as her youngest brother if the difference between their ages is 15 years how old is her youngest brother

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Carl's candies has determined that a candy bar measuring 3 inches long has a z-score of +1 and a candy bar measuring 3.75 inches long has a z-score of +2. what is the standard deviation of the length of candy bars produced at carl's candies?

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Yo need asap pls ! markin da brainiest too !

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