Percent of amphipoda are expected to weigh

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A research biologist determines the average birth weight of fresh water shrimp (amphipoda) is 600 micrograms with a standard deviation of 40 micrograms. What percent of amphipoda are expected to weigh between 500 and 700 micrograms? I know the answer in 98.76, just not sure how to get there?

Reference no: EM132286249

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