Question 12


12.1 Kagiso interviewed all the learners in his class to find out whether or not they were concerned about any of the following issues: Water conservation Nature conservation Fire safety HIV/AIDS He asked every learner that he interviewed to vote for one issue only. He summarised his findings in the pie chart below:


Issues of concern to grade 9 class


Water conservation Nature conservation Fire safety HIV/AIDS None of these


12.1.1 From the pie chart, can you tell how many learners Kagiso interviewed? Give a reason for your answer.


12.1.2 If four learners were concerned about fire safety, estimate how many learners were concerned about each of the other issues. Explain all your reasoning and show any calculations that you make.


12.1.3 Which issue caused the most concern in the class?


12.2 The data below shows the weekly rainfall in millimetres in two towns for one year:


Calvinia: 0; 0; 0; 8; 13; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 10; 0; 0; 0; 0; 3; 0; 0; 0; 0; 0; 0; 0; 20; 22; 0; 0; 0; 0; 49; 52; 0; 0; 0; 0; 0; 0


George: 10; 0; 4; 6; 8; 0; 0; 0; 22; 36; 12; 12; 5; 5; 3; 8; 17; 0; 0; 4; 9; 0; 10; 4; 0; 22; 5; 0; 0; 5; 15; 0; 0; 2; 8; 10; 56; 82; 10; 20; 0; 4; 4; 20; 10; 108; 96; 3; 7; 8; 9; 26


12.2.1 Calculate the mean, median and mode for each town. (3)


12.2.2 Write a short report about the rainfall patterns in each town. Compare the means of the towns, the modes of the towns and the medians of the towns. For each town, which measure of central tendency best describes the rainfall pattern in that town?


(1)


(2) (1)


(2) [9]


Chapter 17: Programme of Assessment


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CHAPTER 17


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