Mathematics (Project Maths)

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1 2010. M130 S Coimisiún na Scrúduithe Stáit State Examinations Commission Leaving Certificate Examination Sample Paper Mathematics (Project Maths) Paper 2 Higher Level Time: 2 hours, 30 minutes 300 marks Running total Examination number Centre stamp For examiner Question Mark Total Grade

2 Instructions There are two sections in this examination paper. Section A Concepts and Skills 150 marks 6 questions Section B Contexts and Applications 150 marks 3 questions Answer all nine questions, as follows: In Section A, answer all six questions In Section B, answer: Question 7 Question 8 either Question 9A or Question 9B. Write your answers in the spaces provided in this booklet. There is space for extra work at the back of the booklet. You may also ask the superintendent for more paper. Label any extra work clearly with the question number and part. The superintendent will give you a copy of the booklet of Formulae and Tables. You must return it at the end of the examination. You are not allowed to bring your own copy into the examination. Marks will be lost if all necessary work is not clearly shown. Answers should include the appropriate units of measurement, where relevant. Answers should be given in simplest form, where relevant. Leaving Certificate 2010 Sample Paper Page 2 of 19 Project Maths, Paper 2 Higher Level

3 Section A Concepts and Skills 150 marks Answer all six questions from this section. Question 1 The events A and B are such that P( A ) = 0 7, P( B ) = 0 5 and P( A B) = 0 3. (25 marks) (a) Find P( A B) (b) Find P( A B ) (c) State whether A and B are independent events, and justify your answer. page running Leaving Certificate 2010 Sample Paper Page 3 of 19 Project Maths, Paper 2 Higher Level

4 Question 2 The shapes of the histograms of four different sets of data are shown below. (25 marks) A B C D (a) Complete the table below, indicating whether the statement is correct ( ) or incorrect ( ) with respect to each data set. A B C D The data are skewed to the left The data are skewed to the right The mean is equal to the median The mean is greater than the median There is a single mode (b) Assume that the four histograms are drawn on the same scale. State which of them has the largest standard deviation, and justify your answer. Answer: Justification: Question 3 The co-ordinates of three points A, B, and C are: A(2, 2), B(6, 6), C( 2, 3). (See diagram on facing page.) (25 marks) (a) Find the equation of AB. Leaving Certificate 2010 Sample Paper Page 4 of 19 Project Maths, Paper 2 Higher Level

5 (b) The line AB intersects the y-axis at D. Find the coordinates of D. D y A x (iii) Find the perpendicular distance from C to AB. C B (iv) Hence, find the area of the triangle ADC. page running Leaving Certificate 2010 Sample Paper Page 5 of 19 Project Maths, Paper 2 Higher Level

6 Question 4 (a) Write down the equation of the circle with centre ( 3, 2) and radius 4. (25 marks) (b) 2 2 A circle has equation x + y 2x+ 4y 15= 0. Find the values of m for which the line mx+ 2y 7= 0 is a tangent to this circle. Leaving Certificate 2010 Sample Paper Page 6 of 19 Project Maths, Paper 2 Higher Level

7 Question 5 (25 marks) The function f ( x) = 3sin(2 x) is defined for x R. (i) Complete the table below x 0 2x π 4 π 2 3π 4 π sin(2 x ) 3sin(2 x ) (ii) Draw the graph of y= f ( x) in the domain 0 x π, x R. y 0 π 4 π 2 3π 4 π x (iii) Write down the range and the period of f. Range = Period = page running Leaving Certificate 2010 Sample Paper Page 7 of 19 Project Maths, Paper 2 Higher Level

8 Question 6 (25 marks) ABCD is a parallelogram in which [ AC ] is a diagonal. a= 2i j, b = 5i + 3 j, and c = i j. (i) Express d in terms of i and j. (ii) Find AC and AB. (iii) Hence, find CAB, correct to the nearest degree. Leaving Certificate 2010 Sample Paper Page 8 of 19 Project Maths, Paper 2 Higher Level

9 You may use this page for extra work page running Leaving Certificate 2010 Sample Paper Page 9 of 19 Project Maths, Paper 2 Higher Level

10 Section B Contexts and Applications 150 marks Answer Question 7, Question 8, and either Question 9A or Question 9B. Question 7 Probability and Statistics (50 marks) An economics student is interested in finding out whether the length of time people spend in education affects the income they earn. The student carries out a small study. Twelve adults are asked to state their annual income and the number of years they spent in full-time education. The data are given in the table below, and a partially completed scatter plot is given. Years of education Income / 1, Annual income / Years of education (i) The last three rows of data have not been included on the scatter plot. Insert them now. (ii) Calculate the correlation coefficient. Answer: (iii) What can you conclude from the scatter plot and the correlation coefficient? (iv) Add the line of best fit to the completed scatter plot above. (v) Use the line of best fit to estimate the annual income of somebody who has spent 14 years in education. Answer: Leaving Certificate 2010 Sample Paper Page 10 of 19 Project Maths, Paper 2 Higher Level

11 (vi) By taking suitable readings from your diagram, or otherwise, calculate the slope of the line of best fit. (vii) Explain how to interpret this slope in this context? (viii) The student collected the data using a telephone survey. Numbers were randomly chosen from the Dublin area telephone directory. The calls were made in the evenings, between 7 and 9 pm. If there was no answer, or if the person who answered did not agree to participate, then another number was chosen at random. List three possible problems regarding the sample and how it was collected that might make the results of the investigation unreliable. In each case, state clearly why the issue you mention could cause a problem. Problem 1: Problem 2: Problem 3: page running Leaving Certificate 2010 Sample Paper Page 11 of 19 Project Maths, Paper 2 Higher Level

12 Question 8 Geometry and Trigonometry (50 marks) Two surveyors want to find the height of an electricity pylon. There is a fence around the pylon that they cannot cross for safety reasons. The ground is inclined at an angle. They have a clinometer (for measuring angles of elevation) and a 100 metre tape measure. They have already used the clinometer to determine that the ground is inclined at 10 to the horizontal. (a) Explain how they could find the height of the pylon. Your answer should be illustrated on the diagram below. Show the points where you think they should take measurements, write down clearly what measurements they should take, and outline briefly how these can be used to find the height of the pylon. Diagram: 10 Measurements to be taken: Procedure used to find the height: Leaving Certificate 2010 Sample Paper Page 12 of 19 Project Maths, Paper 2 Higher Level

13 (b) Write down possible values for the measurements taken, and use them to show how to find the height of the pylon. (That is, find the height of the pylon using your measurements, and showing your work.) page running Leaving Certificate 2010 Sample Paper Page 13 of 19 Project Maths, Paper 2 Higher Level

14 Question 9A Probability and Statistics (50 marks) A car rental company has been using Evertread tyres on their fleet of economy cars. All cars in this fleet are identical. The company manages the tyres on each car in such a way that the four tyres all wear out at the same time. The company keeps a record of the lifespan of each set of tyres. The records show that the lifespan of these sets of tyres is normally distributed with mean km and standard deviation 8000 km. (i) A car from the economy fleet is chosen at random. Find the probability that the tyres on this car will last for at least km. (ii) Twenty cars from the economy fleet are chosen at random. Find the probability that the tyres on at least eighteen of these cars will last for more than km. Leaving Certificate 2010 Sample Paper Page 14 of 19 Project Maths, Paper 2 Higher Level

15 (iii) The company is considering switching brands from Evertread tyres to SafeRun tyres, because they are cheaper. The distributors of SafeRun tyres claim that these tyres have the same mean lifespan as Evertread tyres. The car rental company wants to check this claim before they switch brands. They have enough data on Evertread tyres to regard these as a known population. They want to test a sample of SafeRun tyres against it. The company selects 25 economy cars at random from the fleet and fits them with the new tyres. For these cars, it is found that the mean life span of the tyres is km. Test, at the 5% level of significance, the hypothesis that the mean lifespan of SafeRun tyres is the same as the known mean of Evertread tyres. State clearly what the company can conclude about the tyres. page running Leaving Certificate 2010 Sample Paper Page 15 of 19 Project Maths, Paper 2 Higher Level

16 Question 9B Geometry and Trigonometry (50 marks) (a) Prove that, if two triangles ABC and A'B'C' are similar, then their sides are proportional, in order: AB BC CA = = A B B C C A. Diagram: Given: To prove: Construction: Proof: Leaving Certificate 2010 Sample Paper Page 16 of 19 Project Maths, Paper 2 Higher Level

17 (b) Anne is having a new front gate made and has decided on the design below. A B G E F D C The gate is 2 metres wide and 1 5 metres high. The horizontal bars are 0 5 metres apart. (i) Calculate the common length of the bars [AF] and [DE], in metres, correct to three decimal places. (ii) In order to secure the bar [AF] to [DE], the manufacturer needs to know: - the measure of the angle EGF, and - the common distance AG = DG. Find these measures. Give the angle correct to the nearest degree and the length correct to three decimal places. page running Leaving Certificate 2010 Sample Paper Page 17 of 19 Project Maths, Paper 2 Higher Level

18 You may use this page for extra work Leaving Certificate 2010 Sample Paper Page 18 of 19 Project Maths, Paper 2 Higher Level

19 You may use this page for extra work page running Leaving Certificate 2010 Sample Paper Page 19 of 19 Project Maths, Paper 2 Higher Level

20 Note to readers of this document: This sample paper is intended to help teachers and candidates prepare for the June 2010 examination in the Project Maths initial schools. The content and structure do not necessarily reflect the 2011 or subsequent examinations in the initial schools or in all other schools. Leaving Certificate Higher Level Mathematics (Project Maths) Paper 2 Sample Paper Time: 2 hours 30 minutes

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