QUESTION THREE [20] A consumer affair agency wants to check the average weight of a new product on the market. A random sample of 25 times of the product was taken and the weights (in grams) of these items were classified as follows: Class limit Frequency 74 under 77 3 77 under 80 80 under 83 83 under 86 86 under 89 Cad-BEDS) For the above data calculate 3.1 The mean and the median (6) 3.2 The interquartile range (6) 3.3 The standard deviation (8)