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WJEC Unit 4 2018 June Q5
8 marks Moderate -0.8
Rebecca is a farmer who is monitoring prices for products to use on her farm. She records the prices of two products made from different grains, wheat and oats, at random points in time, to investigate whether there is any correlation. \includegraphics{figure_1} The product moment correlation coefficient for the data is \(0 \cdot 244\). There are 12 data points, and the \(p\)-value is \(0 \cdot 4447\).
  1. Comment on the correlation between the prices of Feed Wheat and Feed Oats. [2]
Rebecca also records the prices of two wheat products at random points in time, to investigate whether there is any correlation. \includegraphics{figure_2} The product moment correlation coefficient for the data is \(0 \cdot 653\). There are 12 data points.
  1. Stating your hypotheses clearly, test at the 5% level of significance whether there is any evidence of correlation between the prices of these two products. [5]
  2. Without referring to the positioning of the points on the graphs, suggest why the product moment correlation coefficient is higher for the second set of data. [1]
WJEC Unit 4 2018 June Q6
4 marks Moderate -0.3
The diagram shows a uniform plank \(AB\) of length 4 m supported in horizontal equilibrium by means of a central pivot. On the plank there are three objects of masses 8 kg, 2 kg and 15 kg placed in positions \(C\), \(D\) and \(E\) respectively. The distance \(AC\) is \(0 \cdot 6\) m and the distance \(AE\) is \(2 \cdot 8\) m. \includegraphics{figure_3} Find the distance \(AD\). [4]
WJEC Unit 4 2018 June Q7
11 marks Standard +0.3
An object of mass \(0 \cdot 5\) kg is thrown vertically upwards with initial speed \(24\) ms\(^{-1}\). The velocity of the object at time \(t\) seconds is \(v\) ms\(^{-1}\). During the upward motion, the object experiences a resistance to motion \(RN\), where \(R\) is proportional to \(v\). When the velocity of the object is \(0 \cdot 2\) ms\(^{-1}\) the resistance to motion is \(0 \cdot 08\) N.
  1. Show that the upward motion of the object satisfies the differential equation $$\frac{\mathrm{d}v}{\mathrm{d}t} = -9 \cdot 8 - 0 \cdot 8\,v.$$ [3]
  2. Find an expression for \(v\) at time \(t\). [6]
  3. Determine the value of \(t\) when the object is at the highest point of the motion. [2]
WJEC Unit 4 2018 June Q8
9 marks Moderate -0.3
An object of mass 60 kg is on a rough plane inclined at an angle of 20° to the horizontal. The coefficient of friction between the object and the plane is \(0 \cdot 3\). Initially, the object is held at rest. A force which is parallel to the plane and of magnitude \(T\) N is applied to the object in an upward direction along the line of greatest slope. The object is then released.
  1. Given that \(T = 15\), calculate the acceleration of the object down the plane. [6]
  2. Given that \(T = 350\), determine whether or not the object moves up the plane. Give a reason for your answer. [3]
WJEC Unit 4 2018 June Q9
10 marks Standard +0.8
Points \(A\) and \(B\) lie on horizontal ground. At time \(t = 0\) seconds, an object \(P\) is projected from \(A\) towards \(B\) such that \(AB\) is the range of \(P\). The speed of projection is \(24 \cdot 5\) ms\(^{-1}\) in a direction which is 30° above the horizontal.
  1. Calculate the range \(AB\) of the object \(P\). [5]
At time \(t = 1\) second, another object \(Q\) is projected from \(B\) towards \(A\) with the same speed of projection \(24 \cdot 5\) ms\(^{-1}\) and in a direction which is also 30° above the horizontal.
  1. Determine the height above the ground at which \(P\) and \(Q\) collide. [5]
WJEC Unit 4 2018 June Q10
6 marks Moderate -0.3
A particle of mass 2 kg moves under the action of a constant force F N, where F is given by $$\mathbf{F} = -3\mathbf{i} + 4\mathbf{j} - 5\mathbf{k}.$$
  1. Find the magnitude of the acceleration of the particle. [3]
  2. Given that at time \(t = 0\) seconds, the position vector of the particle is \(2\mathbf{i} - 7\mathbf{j} + 9\mathbf{k}\) and it is moving with velocity \(3\mathbf{i} - 2\mathbf{j} + \mathbf{k}\), find the position vector of the particle when \(t = 2\) seconds. [3]
WJEC Unit 4 2019 June Q1
5 marks Moderate -0.8
Val buys electrical components from one of 3 suppliers \(A\), \(B\), \(C\), in the ratio \(2:1:7\). The probability that the component is faulty is \(0.33\) for \(A\), \(0.45\) for \(B\) and \(0.05\) for \(C\). Val selects a component at random.
  1. Find the probability that the component works. [3]
  2. Given that the component works, find the probability that Val bought the component from supplier \(B\). [2]
WJEC Unit 4 2019 June Q2
10 marks Standard +0.3
Four children are playing a game in order to win a calculator. They take turns, starting with Alex, followed by Ben, then Caroline, then Danielle, rolling a fair six-sided dice until someone obtains a 6. This player then wins a calculator.
  1. Find the probability that
    1. Danielle wins the calculator on her first turn, [1]
    2. Ben wins the calculator on his first or second turn, [3]
    3. Caroline rolls the dice exactly twice. [3]
  2. Show that the probability that Alex wins the calculator is \(\frac{216}{671}\). [3]
WJEC Unit 4 2019 June Q3
4 marks Easy -1.2
At a fairground, Kirsty throws \(n\) balls in order to try to knock coconuts off their stands. Any coconuts she knocks off are replaced before she throws again. Kirsty counts the number of coconuts she successfully knocks off their stands. On average, she knocks off a coconut with 20\% of her throws.
  1. What assumptions are needed in order to model this situation with a binomial distribution? Explain whether these assumptions are reasonable. [2]
Kirsty uses a spreadsheet to produce the following diagrams, showing the probability distributions of the number of coconuts knocked off their stands for different values of \(n\). \includegraphics{figure_3}
  1. Describe two ways in which the distribution changes as \(n\) increases. [2]
WJEC Unit 4 2019 June Q4
12 marks Standard +0.3
A company produces kettlebells whose weights are normally distributed with mean \(16\) kg and standard deviation \(0.08\) kg.
  1. Find the probability that the weight of a randomly selected kettlebell is greater than \(16.05\) kg. [2]
The company trials a new production method. It needs to check that the mean is still \(16\) kg. It assumes that the standard deviation is unchanged. The company takes a random sample of 25 kettlebells and it decides to reject the new production method if the sample mean does not round to \(16\) kg to the nearest \(100\) g.
  1. Find the probability that the new production method will be rejected if, in fact, the mean is still \(16\) kg. [4]
The company decides instead to use a 5\% significance test. A random sample of 25 kettlebells is selected and the mean is found to be \(16.02\) kg.
  1. Carry out the test to determine whether or not the new production method will be rejected. [6]
WJEC Unit 4 2019 June Q5
9 marks Moderate -0.8
A bowling alley manager in the UK is concerned about falling revenues. He collects data from the United States, hoping to use what he finds to revive his business in the UK. He finds data which seem to show correlation between margarine consumption and bowling alley revenue. He attempts to carry out some statistical analysis in order to present his findings to the board of directors. He produces the scatter diagram shown below. \includegraphics{figure_5} The product moment correlation coefficient for these data is \(-0.7617\). He carries out a one-tailed test at the 1\% level of significance and concludes that higher margarine consumption is associated with lower revenue generated by bowling alleys.
  1. Show all the working for this test. [5]
The manager also conducts a significance test for bowling alley revenue and fish consumption per person. He produces the computer output, shown below, for the analysis of bowling alley revenue versus fish consumption per person. \# Pearson's product-moment correlation
\# data: revenue and fish
\# t = 3.8303, df = 8, p-value = 0.005215
\# alternative hypothesis: true correlation is not equal to 0
\# sample estimates:
\# correlation
\# 0.802423
  1. Comment on the correlation between bowling alley revenue and fish consumption per person and what the board of directors should do in light of the manager's findings in part (a) and part (b). [3]
  2. Give one possible reason why the board of directors might not be happy with the manager's analysis. [1]
WJEC Unit 4 2019 June Q6
9 marks Standard +0.3
A particle \(P\) of mass \(0.5\) kg moves on a horizontal plane such that its velocity vector \(\mathbf{v}\) ms\(^{-1}\) at time \(t\) seconds is given by $$\mathbf{v} = 12\cos(3t)\mathbf{i} - 5\sin(2t)\mathbf{j}.$$
  1. Find an expression for the force acting on \(P\) at time \(t\) s. [3]
  2. Given that when \(t = 0\), \(P\) has position vector \((\mathbf{4i} + \mathbf{7j})\) m relative to the origin \(O\), find an expression for the position vector of \(P\) at time \(t\) s. [4]
  3. Hence determine the distance of \(P\) from \(O\) at time \(t = \frac{\pi}{2}\). [2]
WJEC Unit 4 2019 June Q7
6 marks Moderate -0.8
Three coplanar horizontal forces of magnitude \(21\) N, \(11\) N and \(8\) N act on a particle \(P\) in the directions shown in the diagram. \includegraphics{figure_7}
  1. Given that \(\tan\alpha = \frac{3}{4}\), calculate the magnitude of the resultant force. [5]
  2. Explain why the forces cannot be in equilibrium whatever the value of \(\alpha\). [1]
WJEC Unit 4 2019 June Q8
7 marks Standard +0.3
A box of mass \(2\) kg is projected along a horizontal surface with an initial velocity of \(5\) ms\(^{-1}\). The box experiences a variable resistive force of \(0.4v^2\) N, where \(v\) ms\(^{-1}\) is the velocity of the box at time \(t\) seconds.
  1. Show that \(v\) satisfies the equation $$5\frac{dv}{dt} + v^2 = 0.$$ [2]
  2. Find an expression for \(v\) in terms of \(t\). [4]
  3. Briefly explain why this model is not particularly realistic. [1]
WJEC Unit 4 2019 June Q9
9 marks Standard +0.3
The diagram below shows a spotlight system that consists of a symmetrical track \(XY\) that is suspended horizontally from the ceiling by means of two vertical wires. \includegraphics{figure_9} Each of the three spotlights \(A\), \(B\), \(C\) may be moved horizontally along its corresponding shaded section of the track. The system remains in equilibrium. The track may be modelled as a light uniform rod of length \(1.8\) m and the wires are fixed at a distance of \(0.4\) m from each end. Each of the spotlights may be modelled as a particle of mass \(m\) kg, positioned at the points where they are in contact with the track. The distances of the spotlights relative to the wires are given in the diagram and are such that $$0 \leqslant d_A \leqslant 0.3, \quad 0.1 \leqslant d_B \leqslant 0.9, \quad 0 \leqslant d_C \leqslant 0.3.$$
  1. Given that \(T_1\) and \(T_2\) represent the tension in wires 1 and 2 respectively, show that $$T_1 = mg(2 + d_A - d_B - d_C),$$ and find a similar expression for \(T_2\). [6]
    1. Find the maximum possible value of \(T_1\).
    2. Without carrying out any further calculations, write down the maximum possible value of \(T_2\). Give a reason for your answer. [3]
WJEC Unit 4 2019 June Q10
9 marks Standard +0.3
A tennis ball is projected with velocity vector \((30\mathbf{i} - 14\mathbf{j})\) ms\(^{-1}\) from a point \(P\) which is at a height of \(2.4\) m vertically above a horizontal tennis court. The ball then passes over a net of height \(0.9\) m, before hitting the ground after \(\frac{4}{7}\) s. The unit vectors \(\mathbf{i}\) and \(\mathbf{j}\) are horizontal and vertical respectively. The origin \(O\) lies on the ground directly below the point \(P\). The base of the net is \(x\) m from \(O\). \includegraphics{figure_10}
  1. Find the speed of the ball when it first hits the ground, giving your answer correct to one decimal place. [3]
  2. After \(\frac{2}{5}\) s, the ball is directly above the net.
    1. Find the position vector of the ball after \(\frac{2}{5}\) s.
    2. Hence determine the value of \(x\) and show that the ball clears the net by approximately \(16\) cm. [4]
  3. In fact, the ball clears the net by only \(4\) cm.
    1. Explain why the observed value is different from the value calculated in (b)(ii).
    2. Suggest a possible improvement to this model. [2]
WJEC Further Unit 1 2018 June Q1
6 marks Moderate -0.8
The matrices \(\mathbf{A}\) and \(\mathbf{B}\) are such that \(\mathbf{A} = \begin{bmatrix} 4 & 2 \\ -1 & -3 \end{bmatrix}\) and \(\mathbf{B} = \begin{bmatrix} 4 & 2 \\ 2 & 1 \end{bmatrix}\).
  1. Explain why \(\mathbf{B}\) has no inverse. [1]
    1. Find the inverse of \(\mathbf{A}\). [3]
    2. Hence, find the matrix \(\mathbf{X}\), where \(\mathbf{AX} = \begin{bmatrix} -4 \\ 1 \end{bmatrix}\) [2]
WJEC Further Unit 1 2018 June Q2
6 marks Standard +0.3
Prove, by mathematical induction, that \(\sum_{r=1}^{n} r(r+3) = \frac{1}{3}n(n+1)(n+5)\) for all positive integers \(n\). [6]
WJEC Further Unit 1 2018 June Q3
8 marks Standard +0.3
A cubic equation has roots \(\alpha\), \(\beta\), \(\gamma\) such that $$\alpha + \beta + \gamma = -9, \quad \alpha\beta + \beta\gamma + \gamma\alpha = 20, \quad \alpha\beta\gamma = 0.$$
  1. Find the values of \(\alpha\), \(\beta\) and \(\gamma\). [4]
  2. Find the cubic equation with roots \(3\alpha\), \(3\beta\), \(3\gamma\). Give your answer in the form \(ax^3 + bx^2 + cx + d = 0\), where \(a\), \(b\), \(c\), \(d\) are constants to be determined. [4]
WJEC Further Unit 1 2018 June Q4
7 marks Moderate -0.3
A complex number is defined by \(z = -3 + 4\mathrm{i}\).
    1. Express \(z\) in the form \(r(\cos\theta + \mathrm{i}\sin\theta)\), where \(-\pi \leqslant \theta \leqslant \pi\).
    2. Express \(\bar{z}\), the complex conjugate of \(z\), in the form \(r(\cos\theta + \mathrm{i}\sin\theta)\). [4]
Another complex number is defined as \(w = \sqrt{5}(\cos 2.68 + \mathrm{i}\sin 2.68)\).
  1. Express \(zw\) in the form \(r(\cos\theta + \mathrm{i}\sin\theta)\). [3]
WJEC Further Unit 1 2018 June Q5
8 marks Standard +0.3
  1. Show that \(\frac{2}{n-1} - \frac{2}{n+1}\) can be expressed as \(\frac{4}{(n^2-1)}\). [1]
  2. Hence, find an expression for \(\sum_{r=2}^{n} \frac{4}{(r^2-1)}\) in the form \(\frac{(an+b)(n+c)}{n(n+1)}\), where \(a\), \(b\), \(c\) are integers whose values are to be determined. [6]
  3. Explain why \(\sum_{r=1}^{100} \frac{4}{(r^2-1)}\) cannot be calculated. [1]
WJEC Further Unit 1 2018 June Q6
7 marks Moderate -0.3
  1. Show that \(1 - 2\mathrm{i}\) is a root of the cubic equation \(x^3 + 5x^2 - 9x + 35 = 0\). [3]
  2. Find the other two roots of the equation. [4]
WJEC Further Unit 1 2018 June Q7
5 marks Standard +0.3
The complex number \(z\) is represented by the point \(P(x, y)\) in the Argand diagram and $$|z - 4 - \mathrm{i}| = |z + 2|.$$
  1. Find the equation of the locus of \(P\). [4]
  2. Give a geometric interpretation of the locus of \(P\). [1]
WJEC Further Unit 1 2018 June Q8
9 marks Standard +0.8
The transformation \(T\) in the plane consists of a translation in which the point \((x, y)\) is transformed to the point \((x - 1, y + 1)\), followed by a reflection in the line \(y = x\).
  1. Determine the \(3 \times 3\) matrix which represents \(T\). [4]
  2. Find the equation of the line of fixed points of \(T\). [2]
  3. Find \(T^2\) and hence write down \(T^{-1}\). [3]
WJEC Further Unit 1 2018 June Q9
14 marks Standard +0.3
The line \(L_1\) passes through the points \(A(1, 2, -3)\) and \(B(-2, 1, 0)\).
    1. Show that the vector equation of \(L_1\) can be written as $$\mathbf{r} = (1 - 3\lambda)\mathbf{i} + (2 - \lambda)\mathbf{j} + (-3 + 3\lambda)\mathbf{k}.$$
    2. Write down the equation of \(L_1\) in Cartesian form. [4]
The vector equation of the line \(L_2\) is given by \(\mathbf{r} = 2\mathbf{i} - 4\mathbf{j} + \mu(4\mathbf{j} + 7\mathbf{k})\).
  1. Show that \(L_1\) and \(L_2\) do not intersect. [5]
  2. Find a vector in the direction of the common perpendicular to \(L_1\) and \(L_2\). [5]