IFYMB004 Maths (Business) Exam 3
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THE NCUK INTERNATIONAL FOUNDATION YEAR
IFYMB004 Mathematics (Business)
Examination
Question 1
A student invests £3600 in an account which pays compound interest at 4% per year.
Find the total interest gained after 3 years. [ 3 ]
Question 2
Two events, A and B , are such that P(A) = 0.43, P(B) = 0.47 and
P(A ∩ B) = 0. 15.
(a) Write down P(A′).
(b) Draw a Venn diagram to show this information.
(c) Work out P(A ∪ B′).
Question 3
Point A (−2, 8) lies on line l1 which has equation y = 2x + 12.
Line l2 passes through point A and is perpendicular to line l1 .
(a) Find the equation of line l2 .
Give your answer in the form y = mx + c.
Lines l1 and l2 cross the x − axis at points P and Q respectively.
(b) Find the area of triangle PAQ.
Question 4
(a) In the expansion of (k + x ) where k > 0, the coefficient of the x 2 term
is
4 times larger than the coefficient of the x 3 term.
Find the values of k.
(b) An arithmetic series has first term a and common difference d.
If Sn denotes the sum of the first n terms, and S2n denotes the sum of the [ 4 ]
first 2n terms, prove that if S2n = 4Sn , then d = 2a.
Question 5
A shop sells bars of milk chocolate and bars of plain chocolate. Over a period of 5 days the numbers of sales of milk chocolate bars (x) and the numbers of sales of plain chocolate bars (y) are recorded. The results are shown in the table below.
x |
y |
2 |
xy |
5 |
6 |
25 |
|
18 |
13 |
324 |
|
36 |
18 |
1296 |
|
29 |
15 |
841 |
|
17 |
8 |
289 |
|
∑ x = 105 |
∑ y = 60 |
∑ x 2 = 2775 |
|
(a) Complete the table. (You need to write down only the last column)
(b) Find sxx and syy and hence work out the equation of the regression line
of y on x.
(c) A student uses her equation to estimate the number of plain chocolate bars sold when 32 milk chocolate bars have been sold.
Give a reason why her estimate could be considered reliable.
Give also a reason why it could not be considered reliable.
Question 6
A curve has equation x 2 + y 2 = 100.
(b) Use substitution to solve the equations 3x − 4y = 50
x 2 + y 2 = 100
(c) What can you say about the curve with equation x 2 + y 2 = 100 and the [ 1 ] line with equation 3x − 4y = 50?
Question 7
(a)
Figure 1 shows the quadrilateral ABCD which is made up of triangles ABD and BCD. AB = 6 cm, AD = 8 cm. BC = 8 cm and CD = 10 cm.
Angle A = e° and angle C = p° .
Show that cos p = (a + b cos e) where a and b are integers to be [ 3 ]
determined.
(b)
Figure 2 shows the acute-angled triangle LMN where MN = 9 metres and LN = 8 metres. Angle L = p° and angle M = q° .
You are given sin p = .
Find sin q.
Give your answer in the form where c and d are integers.
(c) Solve tan(2e + 40°) = (0° < e < 360°)
Question 8
(a) The curve y = e 2 − 8X has a stationary value at point C.
Find, in exact form, the coordinates of point C.
(b) Solve the equation log 3X − 6 log 3 + 1 = 0 (X > 0)
You must show all of your working.
Question 9
(a)
Figure 3 shows a box in the shape of a cuboid.
The box is 2X metres long, X metres wide and ℎ metres deep.
The box has a bottom but it has no top.
The outside surface area is 4.86 m2 .
Find ℎ in terms of X and hence show that the volume of the box, V, is
given by
V = 1.62X − X 3
(b) Use calculus to find the value of X which gives the maximum volume and [ 7 ]
hence confirm that your value of X gives a maximum.
Question 10
(a)
Figure 4 shows the curve y = x 2 − 16x + 67 and the line y = x + 4. The curve and the line intersect at (6, 7). The line x = 9 is also shown.
Find the area, which is shaded on the diagram, that is bounded by the
curve y = x 2 − 16x + 67 , the line y = x + 4, the line x = 9 and both axes.
(b) Find [ 3 ]
∫ ( − 3t)2 dt.
Question 11
A student plays two games of squash. The probability that he wins the first game is p.
If he wins the first game, the probability that he wins the second is 2p. If he does not win the first game, the probability that he wins the second is p.
(a) Draw a fully labelled tree diagram.
The probability that the student won the first game, given that he wins the
second is .
(b) Find the value of p.
Question 12
During one morning in a large shop, 112 payments were made by credit card. The time it took for the payments to be taken from the cardholders’ accounts were recorded, and the results are shown in the table below.
Time, t, in hours |
Frequency |
0 < t ≤ 2 |
5 |
2 < t ≤ 4 |
12 |
4 < t ≤ 6 |
24 |
6 < t ≤ 8 |
31 |
8 < t ≤ 10 |
18 |
10 < t ≤ 12 |
12 |
12 < t ≤ 14 |
6 |
14 < t ≤ 16 |
4 |
(You may wish to copy and extend this table to help you answer the questions below.) Estimate the mean. You must show your working On graph paper, draw a cumulative frequency curve. |
|
Use your cumulative frequency curve to estimate the median and [ 3 ]
interquartile range.
You must show evidence that you have read these values from your graph.
Question 13
(a) In a large college, it is reckoned that 40% of the students have grey eyes.
A sample of 30 students is chosen, and x students are found to have grey eyes.
Find the smallest possible value of x if the probability of x or less students having grey eyes is greater than . You must show your working.
(b) The masses of melons can be assumed to follow a Normal distribution with
mean 320 grams and standard deviation 25 grams.
What percentage of melons have masses between 289 grams and 351 grams?
(c) A random variable, X, has probability distribution as shown in the table below.
x |
2 |
4 |
5 |
8 |
10 |
20 |
P(X = x) |
0.07 |
0.15 |
0.25 |
0.16 |
0.17 |
0.2 |
Find E(X) and E ( )
Give your answer for E ( ) to 3 significant figures.
In this question, 1 mark will be given for the correct use of significant figures.
Question 14
(a) Differentiate 4x ln(x2 + 1)
You do not need to simplify your answer.
(b) A curve has equation y =
Use the Quotient Rule to find and hence show that there are no
stationary values on the curve.
(c) Another curve has equation sin x − cos y + e 3y − e 2x = 0.
dy
dx
Question 15
(a) The function f(x) is defined as
f(x) =
Explain why f(x) has to be written in the form A +
before being expressed in partial fractions.
4 + 5 |
( − 1)( + 2) |
State the value of A and write
(b) Find
4 + 5 |
( − 1)( + 2) |
∫ 12x e −2 dx. |
in partial fractions.
(c) Evaluate
Give your answer in the form
0
∫ dx .
−1
where k is an integer.
2023-06-02