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- Let the ED50 of a recreational drug be defined as the amount required for 50% of a test group to feel high or get a buzz. If the ED50 value of ethanol is 470 mg/kg body mass, what dose would a 70 kg party goer need to quickly consume in order to have a 50% chance of getting a buzz? 235 mg 470 mg 32,900 mg 35,000,000 mgWhat is the dilution of serum in a tube containing 200 µl of serum, 500 µl of saline and 300 µl of reagent?What is the single dose for a child weighing 53 lbs if the usual pediatric dose of cefazolin sodium is 25 mg/kg/day divided equally into 3 doses?