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Big chickens: A report from a poultry industry news Web site stated that the weights of broilers (commercially raised chickens) are approximately normally distributed with mean 1387 grams and standard deviation 162 grams. Use the TI-84 PLUS calculator and round your answers to at least two decimal places. (a) Find the 20th percentile of the weights. (b) Find the 82nd percentile of the weights. (c) Find the rst quartile of the weights. (d) A chicken farmer wants to provide a money-back guarantee that his broilers will weigh at least a certain amount. What weight should he guarantee so that he will have to give his customers' money back only 1% of the time