SELF-REVIEW 4-2 The Quality Control department of Plainsville Peanut Company is responsible for checking the weight of the 8-ounce jar of peanut butter. The weights of a sample of nine jars produced last hour are: 7.69 7.72 7.80 7.86 7.90 7.94 7.97 8.06 8.09 (a) What is the median weight? (a) Determine the weights corresponding to the first and third quartiles.

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