1 (Total: 20 marks) A sample of 10 households was taken showing their grocery spending for a particular week: $127 $133 $89 $129 $76 $144 $88 $110 $118 $67 Calculate: a) the mean, median and mode b) the standard deviation c) the coefficient of variation d) the interquartile range (5 marks) (6 marks) (3 marks) (6 marks)