18.6 CHAPTER 18. STATISTICS
More practice video solutions or help at http://www.everythingmaths.co.za(1.) 015v
Chapter 18 End of Chapter Exercises
- Many accidents occur during the holidays between Durban and Johannesburg. A
study was done to seeif speeding was a factorin the high accident rate. Use the
results given to answer the following questions.
Speed (km/h) Frequency
60 < x≤ 70 3
70 < x≤ 80 2
80 < x≤ 90 6
90 < x≤ 100 40
100 < x≤ 110 50
110 < x≤ 120 30
120 < x≤ 130 15
130 < x≤ 140 12
140 < x≤ 150 3
150 < x≤ 160 2(a) Draw a graph to illustrate this information.
(b) Use your graph to find the median speed and the interquartile range.
(c) What percent of carstravel more than 120 km/h on this road?
(d) Do cars generally exceed the speed limit?- The following two diagrams (showing two schools contribution to charity) have been
exaggerated. Explain how they are misleading and redraw them so thatthey are not
misleading.
R100R100R100R200.00R200.00- The monthly incomeof eight teachers are given as follows:
R10 050; R14 300; R9 800; R15 000; R12 140; R13 800; R11 990; R12 900.