A consumer affairs agency wants to check the average weight of a new product on the market. A random sample of 25 items of the product was taken and the weights (in grams) of these items were classified as follows: class boundaries frequency 74- 77 3 77- 80 6 80- 83 9 83-86 3 86- 89 4               (a) Find the third quartile of the weights  (b) What percentage of the items had a weight less than 83 grams?  (c) Calculate the mean and standard deviation of the weights.

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