Statistics and probalbility

(h) The energy commission directed an oicer to report the proportion of the type of electric users in Malaysia. The ofce prepared a pie chart from the sample he collected based on stratied sampling. as shown below. {i} Briefly explain how the ofcer collects the sample based on stratied sampling. (3 marks} (ii) State two mistakes of the above pie chart. (2 marks} (iii) If the officer wants to show the difference between the categories. propose a better altemative for the above pie chart. Give a reason for the chart you propose. (3 marks} [Total : 25 marks]