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What is the binomial expansion of (2x-3)^5

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?

Find the rate at which the water is now flowing from the tap give your answer cubic centimetres per second