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 classied as follows: Class limit Frequency 74 under 77 3 77 under 80 80 under 83 83 under 86 86- under 89 (Oh-LOO) Page 3 of 7 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)