## Tuesday, March 29, 2011

### Data Handling (Pie Chart)

PIE CHART
source: Worksheet 16.1 Q2

The Pie Chart below represents the traffic condition outside SST at 7.25 am on a typical morning.
(a) Find the angle of the sector representing motorcycle to the nearest degree.
(b) Find the percentage of sector representing cars, correct your answer to 3 significant figures.
(c) Is it possible to present the above information using line graph? Justify your answer.

courtesy of Ms LohKY
edited by Mr Johari

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3. a) 14°
b) 69%
c) No as all are in the same timing and it is not possible to classify them together, probably it would be weird.

4. a)27º
b)69.2%
c)No, as this information is only at the time of 7.25am and not over a long period of time.

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6. a)27º
b)69%
c) No as we are not showing the increase of vehicles in time but the number during the certain time.

7. a) 28º
b) 69.2%
c) No. It is only presenting the information at the time of 7.25 am, not over a period of time.

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9. a) 14º
b) 69.2%
c) No. The number of cars is not set over a period of time.

10. a) 28º
b) 69.2%
c) No. Again, Line Graphs are used to represent the information of an object or place for a duration of time, and since this information is about the number of vehicles at a certain time of day.

11. a) 28˚
b) 69.2%
C) No, as it is only measuring the amount of vehicles at 7.25am, not over a long period of time.

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13. a)260º
b)69%
c)No it is not showing the number of vehicles across a period of time

14. a) The angle corrected to the nearest degree is 27º
b) The percentage is about 69%
c) No it is not possible as line graphs show changes in an amount of time but the information here shows a fixed amount of vehicles(numbers) at the same time, 7.25am

15. 1)14%
2)69%
3)No.The number of cars are definitely not set over a period of time.

16. a)8 degrees
b)69%
c)No. It cannot be represented as two figures for the pie chart

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18. a. 18º
b. 69.2º
c. Nope, as line graphs are used to represent changes over a period of time, which does not apply for this pie chart.

19. a)30º
b)69%
c) no as it is not over a period if time

20. a) 6.92( 3 SF ) ≈ 7º
b) 69.23 ( 4 SF ) ≈ 69.2 ( 3 SF )
c) It is not possible as this graph is just showing vehicles at 7.25 am while line graph does not as it records data over a long period of time.

21. a) 28º
b)69.2
c) No, lines graph only shows the no. of vehicles recorded at a specific time but it does not add the vehicle up like the pie chart.

22. (a) 30º

(b) 69.2%

(c) ) No. It is only presenting the information at one point of time of and, not over a period of time.

23. a) 28º
b)69.2%
c) No it is not possible as line graph is to show a change in something over time. The information here is at a certain time and not over a while.

24. a) motorcycle = 3
total = 39
angle = 3/39 x 360 = 28 degrees

b) cars = 27
total = 39
percentage = 27/39 x 100% = 69.2% (3 s.f.)

c) No as there may be different vehicles arriving at the same time so it is not possible to express that in a line graph unless each vehicle type has an individual line graph to show the amount of that particular vehicles during that particular time.

25. a)28 degrees

b)69.2%

c)It is not possible to represent the information in a line graph. Line graphs can only be used in a period of time and the vehicles do not appear time after time.

26. a)27º
b)69º

c)The information is not possible to be represented in a line graph as line graphs can only represent something in a period of a time and not over a period of time