JAMB UTME - Mathematics - 1995

Question 1 Report

Solve the inequality $ (x - 3)(x - 4) \le 0 $

3

\leq

x

\leq

4

3 < x < 4

3

\leq

x < 4

3 < x

\leq

4

Linear Inequalities

Inequalities

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Question 2 Report

Simplify $ \frac{x^2 - 1}{x^3 + 2x^2 - x - 2} $

\frac{1}{x + 2}

\frac{x - 1}{x + 1}

\frac{x - 1}{x + 2}

x−1x+2

\frac{1}{x - 2}

Answer Details

\frac{x^{2} - 1}{(x - 1) (x + 2) (x + 1)}

=

\frac{(x - 1) (x + 1)}{(x - 1) (x + 2) (x + 1)}

=

\frac{1}{x + 2}

View Answer

Question 3 Report

Which of the following binary operations is cumulative in the set of integers?

a

*

b = a + 2b

a

*

b = a + b - ab

a

*

b = a2 + b

a

*

b =

\frac{a (b + 1)}{2}

Binary Operations

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Question 4 Report

Express the product of 0.0014 and 0.011 in standard form

1.54 x 10-2

1.54 x 10-3

1.54 x 10-4

1.54 x 10-5

Fractions, Decimals And Approximations

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Question 5 Report

Four members of a social first eleven cricket team are also members of the first fourteen rugby team. How many boys play for at least one of the two teams?

25

21

16

3

Sets

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Question 6 Report

Class Interval	Frequency	Class boundaries	Class Mid−point
$1.5-1.9$	$2$	$1.45-1.95$	$1.7$
$2.0-2.4$	$21$	$1.95-2.45$	$2.2$
$2.5-2.9$	$4$	$2.45-2.95$	$2.7$
$3.0-2.9$	$15$	$2.95-3.45$	$3.2$
$3.5-3.9$	$10$	$3.45-3.95$	$3.7$
$4.0-4.4$	$5$	$3.95-4.45$	$4.2$
$4.5-4.9$	$3$	$4.45-4.95$	$4.7$

Find the mode of the distribution above to find the mode of the distribution.

3.2

3.3

3.7

4.2

Answer Details

Mode = a + (b - a)(fm - Fb)

2Fm - Fa - Fb

= 3.0 + $\frac{(3.4 - 3) (15 - 4)}{2 (15) - 4 - 10}$

= 3 + $\frac{(6.4) (11)}{30 - 14}$

= 3 + $\frac{4.4}{16}$

= 3 + 0.275

= 3.275

= 3.3cm

Read lesson note on Representation Of Data (JAMB)

Read lesson note on Measures Of Dispersion (JAMB)

Representation Of Data

Measures Of Dispersion

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Question 7 Report

In the diagram, find PQ if the area of triangle PQR is 35cm2

7cm

10cm

14cm

17cm

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Question 8 Report

Factorize completely the expression abx2 + 6y - 3ax - 2byx

(ax - 2y)(bx - 3)

(bx + 3)(2y - ax)

(bx + 3)(ax - 2y)

(ax - 2y)(ax - b)

Solution Of Linear Equations

Algebraic Expressions

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Question 9 Report

Finds a positive value of p if the expression 2x2 - px + p leaves a remainder 6 when divided by x - p and q

1

2

3

4

Modular Arithmetic

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Question 10 Report

Two variables x and y are such that $ \frac{dy}{dx} = 4x - 3 $ and y = 5 when x = 2. Find y in terms of x

2x2 - 3x + 5

2x2 - 3x + 3

2x2 - 3x

4

Solution Of Linear Equations

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Question 11 Report

Calculate 33105 - 14425

13135

21315

43025

11035

Number Bases

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Question 12 Report

A school boy lying on the ground 30m away from the foot of a water tank tower observes that the angle of elevation of the top of the tank 60o. Calculate the height of the water tank.

60m

30

\sqrt{3}

m

20

\sqrt{3}

m

10

\sqrt{3}

m

View Answer

Question 13 Report

Find the area bounded by the curve $y = 3x^2 - 2x + 1$, the coordinates $x = 1$ and $x = 3$ and the x-axis

24

22

21

20

Areas

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Question 14 Report

A die has four of it's faces coloured white and the remaining two coloured black. What is the probability that when the die is thrown two consecutive time, the top face will be white in both cases?

\frac{2}{3}

\frac{1}{9}

\frac{4}{9}

\frac{1}{36}

Probability

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Question 15 Report

Class Interval	Frequency	Class boundaries	Class Mid-point
$1.5 - 1.9$	$2$	$1.45 - 1.95$	$1.7$
$2.0 - 2.4$	$21$	$1.95 - 2.45$	$2.2$
$2.5 - 2.9$	$4$	$2.45 - 2.95$	$2.7$
$3.0 - 2.9$	$15$	$2.95 - 3.45$	$3.2$
$3.5 - 3.9$	$10$	$3.45 - 3.95$	$3.7$
$4.0 - 4.4$	$5$	$3.95 - 4.45$	$4.2$
$4.5 - 4.9$	$3$	$4.45 - 4.95$	$4.7$

The median of the distribution above is

4.0

3.4

3.2

3.0

Answer Details

Median =

\frac{a + b}{f m}

(

\frac{1}{2} \sum f - C F_{b}

)
= 2.95 +

\frac{0.5}{15}

(2.-7)
= 2.95 +

\frac{0.5}{15}

x 13
= 2.95 + 0. 43
= 3.38
= 3.4

View Answer

Question 16 Report

Use the graph of the curve $y = f(x)$to solve the inequality $f(x) \le 0$

-1

\geq

x

\geq

1, x

\geq

2

x

\leq

-1, 1

\geq

x

\geq

2

x

\geq

-1, 1

\geq

x

\geq

2

x

\geq

2, -1

\geq

x

\geq

1

Answer Details

-1

\geq

x

\geq

1, 1 < x

\geq

2

Combining solutions

= x $\leq$ 1; 1 $\geq$ x $\geq$ 2

Read lesson note on Linear Inequalities (WAEC)

Linear Inequalities

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Question 17 Report

Express $ \frac{5x-12}{(x-2)(x-3)} $ in partial fractions

\frac{2}{x + 2} - \frac{3}{x - 3}

\frac{2}{x - 2} + \frac{3}{x - 3}

\frac{2}{x - 3} - \frac{3}{x - 2}

\frac{5}{x - 3} - \frac{4}{x - 2}

Answer Details

$\frac{5 x - 12}{(x - 2) (x - 3)} = \frac{A}{x - 2} + \frac{B}{x - 3}$

= $\frac{A (x - 3) + B (x - 2)}{(x - 2) (x - 3)}$

⟹5x−12=Ax−3A+Bx−2B

$A + B = 5 . . . (i)$

−(3A+2B)=−12⟹3A+2B=12...(ii)

From (i), $A = 5 - B$

$3 (5 - B) + 2 B = 12$

15−3B+2B=12⟹B=3

A+3=5⟹A=2

$\frac{5 x - 12}{(x - 2) (x - 3)} = \frac{2}{x - 2} + \frac{3}{x - 3}$

Read lesson note on Algebraic Expressions (WAEC)

Algebraic Expressions

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Question 18 Report

class	1−3	4−6	7−9
Frequency	5	8	5

Find the standard deviation of the data using the table above

5

\(\sqrt{6}\0

\frac{5}{3}

\sqrt{5}

Answer Details

\begin{matrix} class intervals & F r e (F) & class-marks(x) & F x & (x - x) & (x - x)^{2} & F (x - x)^{2} \\ 1 - 3 & 5 & 10 & 10 & - 3 & 9 & 90 \\ 4 - 6 & 8 & 40 & 40 & 0 & 0 & 0 \\ 7 - 9 & 5 & 40 & 40 & 3 & 9 & 360 \\ 18 & 90 & 450 \end{matrix}

x =

\frac{\sum f x}{\sum f}

=

\frac{90}{18}

= 5
S.D =

\frac{\sum f (x - x)^{2}}{\sum f}

=

\frac{450}{18}

=

\sqrt{25}

= 5

View Answer

Question 19 Report

If $a \ast b = +\sqrt{ab}$, evaluate $2 \ast (12 \ast 27)$

12

9

6

2

View Answer

Question 20 Report

Evaluate $ \frac{(18)^{\frac{3}{4}}-(27)^3}{3\times 2^3} $

27

1

\frac{1}{3}

\frac{1}{8}

Number Bases

Modular Arithmetic

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Question 21 Report

Two perpendicular lines PQ and QR intersect at (1, -1). If the equation of PQ is x - 2y + 4 = 0, find the equation of QR

x + 2y - 1= -0

2x + y - 3 = 0

x - 2y - 3 = 0

2x + y - 1

Algebraic Expressions

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Question 22 Report

For what value of x is the tangent to the curve $y = x^2 - 4x + 3$ parallel to the x-axis?

3

2

1

0

Statistics

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Question 23 Report

Simplify $ \frac{\sqrt{12}-\sqrt{3}}{\sqrt{12}+\sqrt{3}} $

\frac{1}{3}

9

16cm

3

Number Bases

Sets

Fractions, Decimals, Approximations And Percentage

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Question 24 Report

Age in years	13	14	15	16	17
No. of students	3	10	30	42	15

The frequency distribution above shows the ages of students in a secondary school. In a pie chart constructed to represent the data, the angles corresponding to the 15 years old is

27o

30o

54o

108o

View Answer

Question 25 Report

In a triangle XYZ, < YXZ = 44° and < XYZ = 112°. Calculate the acute angle between the internal bisectors of < XYZ and < XZY.

12o

56o

68o

78o

Angles

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Question 26 Report

If $x - 1$ and $x + 1$ are both factors of the equation $x^3 + px^2 + qx + 6 = 0$, evaluate $p$ and $q$

6, -1

6, 1

1, -1

6, -6

-6, -1

Solution Of Linear Equations

Algebraic Expressions

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Question 27 Report

The variance of the scores 1, 2, 3, 4, 5 is

1.25

1.40

2.05

3.00

Measures Of Dispersion

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Question 28 Report

If $x = \begin{pmatrix}1 & 2 \\ 0 & 3\end{pmatrix}$ and $y = \begin{pmatrix}2 & 1 \\ 4 & 3\end{pmatrix}$. Find $xy$.

(\begin{matrix} 10 & 7 \\ 12 & 9 \end{matrix})

(\begin{matrix} 2 & 7 \\ 4 & 17 \end{matrix})

(\begin{matrix} 10 & 4 \\ 4 & 6 \end{matrix})

(\begin{matrix} 4 & 3 \\ 10 & 9 \end{matrix})

Matrices And Determinants

Modular Arithmetic

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Question 29 Report

P is on the locus of points equidiatant from two given points X and Y. UV is a straight line throuh Y parallel to the locus. If < PYU is 40°, find < XPY.

100o

80 o

50 o

40 o

Answer Details

< PYU = < YPQ = 40°(Alternative) = PQ

∥

UV

< XPQ = < YPQ = 40°, Since QX = QY

therefore < XPY = 80°

Read lesson note on Loci (WAEC)

Loci

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Question 30 Report

The length of a notebook 15cm, was measured as 16.8cm. Calculate the percentage error to 2 significant figures.

12.00%

11.00%

10.71%

0.12%

Percentages

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Question 31 Report

A worker's present salary is ₦24,000 per annum. His annual increment is 10% of his basic salary at the beginning of the third year?

₦28,800

₦29,040

₦31,200

₦31,944

View Answer

Question 32 Report

Find the sum to infinity of the following sequence 1. $ \frac{9}{10} $, 2. ($ \frac{9}{10} $), 3. ($ \frac{9}{10} $)

\frac{1}{10}

\frac{9}{10}

\frac{10}{9}

10

Sequence And Series

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Question 33 Report

The derivative of cosec x is

tan x cosec x

-cot x cosec x

tan x sec x

-cot x sec x

Matrices And Determinants

Introductory Calculus

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Question 34 Report

PT is a tangent to the circle TYZX. YT = YX and < PTX = 50o. Calculate < TZY

50o

65o

85o

130o

Answer Details

XTY = 50o = TXY =

\frac{130^{o}}{2}

= 65o

Read lesson note on Circles (WAEC)

Circles

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Question 35 Report

Let $p$ be a probability function on set $S$, where $S = (a_1, a_2, a_3, a_4)$. Find $P(a_1)$ if $P(a_2) = \frac{1}{3}$, $p(a_3) = \frac{1}{6}$ and $p(a_4) = \frac{1}{5}$

\frac{7}{3}

\frac{2}{3}

\frac{1}{3}

\frac{3}{10}

Probability

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Question 36 Report

If S = (x : x2 = 9, x > 4), then S is equal to

4

{0}

\oplus

{

\oplus

}

Algebraic Fractions

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Question 37 Report

In the diagram, the base diameter is 14cm while the height is 12cm. Calculate the total surface area if the cylinder has both a base and a top.[$ \pi \frac{22}{7} $]

836cm2

308cm2

528cm2

154cm2

Volumes

Areas

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Question 38 Report

The 4th term of an A.P is 13 while the 10th term is 31. Find the 21st term

175

85

64

45

Sequence And Series

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Question 39 Report

\[ \begin{vmatrix} -2 & 1 & 1 \\ 2 & 1 & k \\ 1 & 3 & -1 \end{vmatrix} = 23 \]

1

2

3

4

Number Bases

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Question 40 Report

The mean and the range of the set of numbers 1, 20, 1.00, 0.90, 1.40, 0.80, 1.20 and 1.10 are me and r

1.11

1.65

1.85

2.45

View Answer

Question 41 Report

The pie chart above shows the distribution of students in a secondary school class. If 30 students offered French, how many offered CRK?

25

15

10

8

Percentages

Modular Arithmetic

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Question 42 Report

Find the distance between two towns p(45$^{o}$N, 30$^{o}$W) and Q(15$^{o}$S, 30$^{o}$W) if the radius of the earth is 7000km. [$\pi = \frac{22}{7}$]

\frac{1100}{3}

km

\frac{2200}{3}

km

\frac{22000}{3}

km

\frac{1100}{3}

km

Coordinate Geometry

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Question 43 Report

The graph of f(x) = x2 - 5x + 6 crosses the x-axis at the points

(-6, 0), (-1, 0)

(-3, 0), (-2,0)

(-6, 0),(1, 0)

(2, 0), (3, 0)

Graphs Of Linear And Quadratic Functions

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Question 44 Report

The mean and the range of the set of numbers 1.20, 1.00, 0.90, 1.40, 0.80, 1.20, and 1.10 are m and r respectively. Find m + r

1.11

1.69

1.85

2.45

Linear Inequalities

Measures Of Dispersion

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Question 45 Report

Determine the value of x in the figure.

134

^{\circ}

81

^{\circ}

53

^{\circ}

46

^{\circ}

Angles

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Question 46 Report

Find T in terms of K, Q and S if S = 2r$ \pi $QT + K)

\frac{S^{2}}{2 π r^{2} Q} - \frac{k}{Q}

\frac{S^{2}}{2 π r^{2} Q}

- k

\frac{S^{2}}{4 π r^{2} Q} - \frac{k}{Q}

\frac{s^{2}}{4 π r^{2} Q}

Answer Details

\frac{s^{2}}{4 r^{2}}

= QT

π

+ KT

\frac{s^{2}}{4 r^{2}}

- k

π

= QT

π

T = $\frac{s^{2}}{4 Q π r^{2}}$ - k

Read lesson note on Quadratic Equations (WAEC)

Quadratic Equations

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Question 47 Report

Convert 3.1415926 to 5 decimal places

3.14160

3.14159

0.31415

3.14200

Fractions, Decimals And Approximations

Modular Arithmetic

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Class Interval	Frequency	Class boundaries	Class Mid−point
\(1.5-1.9\)	\(2\)	\(1.45-1.95\)	\(1.7\)
\(2.0-2.4\)	\(21\)	\(1.95-2.45\)	\(2.2\)
\(2.5-2.9\)	\(4\)	\(2.45-2.95\)	\(2.7\)
\(3.0-2.9\)	\(15\)	\(2.95-3.45\)	\(3.2\)
\(3.5-3.9\)	\(10\)	\(3.45-3.95\)	\(3.7\)
\(4.0-4.4\)	\(5\)	\(3.95-4.45\)	\(4.2\)
\(4.5-4.9\)	\(3\)	\(4.45-4.95\)	\(4.7\)

Class Interval	Frequency	Class boundaries	Class Mid-point
\(1.5 - 1.9\)	\(2\)	\(1.45 - 1.95\)	\(1.7\)
\(2.0 - 2.4\)	\(21\)	\(1.95 - 2.45\)	\(2.2\)
\(2.5 - 2.9\)	\(4\)	\(2.45 - 2.95\)	\(2.7\)
\(3.0 - 2.9\)	\(15\)	\(2.95 - 3.45\)	\(3.2\)
\(3.5 - 3.9\)	\(10\)	\(3.45 - 3.95\)	\(3.7\)
\(4.0 - 4.4\)	\(5\)	\(3.95 - 4.45\)	\(4.2\)
\(4.5 - 4.9\)	\(3\)	\(4.45 - 4.95\)	\(4.7\)






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