The following data represents the prices (in R) of 50 items purchased by a shopper. Price (R) 0.00 20.00 20.00 <40.00 Frequency 6 9 40.00 <60.00 18 60.00 80.00 13 80.00 100.00 4 Determine the: 1.1 mean price 1.2 median price. 1.3 modal price 1.4 standard deviation (9 marks) (5 marks) (5 marks) (11 marks)