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Mathematics Past Questions and Answers
Topic: Variance
Classroom
Jamb
Exam year:
Exam year
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
Question type:
Question type
Objective
Theory
Topics:
Topics
[1] NUMBER AND NUMERATION
[1].1 Number bases
[1].1.1 operations in different number bases from 2 to 10
[1].1.2 conversion from one base to another including fractional parts
[1].2 Fractions, Decimals, Approximations and Percentages
[1].2.1 Fractions
[1].2.2 Decimals
[1].2.3 Significant figures
[1].2.4 decimal places
[1].2.5 Percentages errors
[1].2.6 Simple interest
[1].2.7 Profit and loss percent
[1].2.8 Ratio, proportion and rate
[1].2.9 Shares and valued added tax
[1].2.10 Approximations
[1].3 Indices, Logarithms and Surds
[1].3.1 Laws of Indices
[1].3.2 equations involving indices
[1].3.3 Standard form
[1].3.4 Laws of Logarithms
[1].3.5 Logarithm of any positive number to a given base
[1].3.6 change of bases in logarithm and application
[1].3.7 relationship between indices and logarithm
[1].3.8 Surds
[1].4 Sets
[1].4.1 Types of sets
[1].4.2 algebra of sets
[1].4.3 Venn diagrams and their applications
[2] ALGEBRA
[2].1 Polynomials
[2].1.1 Change of subject of formula
[2].1.2 Multiplication and division of polynomials
[2].1.3 Factorization of polynomials of degree not exceeding 3
[2].1.4 Roots of a polynomials not exceeding degree 3
[2].1.5 Factor and remainder theorems
[2].1.6 Simultaneous equations including one linear one quadratic
[2].1.7 Graphs of polynomials of degree not greater than 3
[2].2 Variation
[2].2.1 Direct
[2].2.2 Inverse
[2].2.3 Joint
[2].2.4 Partial
[2].2.5 Percentage increase and decrease
[2].3 Inequalities
[2].3.1 analytical and graphical solutions of linear inequalities
[2].3.2 quadratic inequalities with integral roots only
[2].4 Progression
[2].4.1 Nth term of a progression
[2].4.2 Sum of Arithmetic progression
[2].4.3 Sum of Geometric progression
[2].5 Binary Operations
[2].5.1 properties of closure, commutativity, associativity and distributivity
[2].5.2 Identity element (simple cases only)
[2].5.3 Inverse element (simple cases only)
[2].6 Matrices and Determinants
[2].6.1 algebra of matrices not exceeding 3 x 3
[2].6.2 Determinants of a matrix not exceeding 3 x 3
[2].6.3 Inverse of 2 x 2 matrices; [excluding quadratic and higher degree equations].
[2].6.4 Addition and Subtraction of matrices
[2].6.5 Multiplication of matrices
[2].6.6 Transpose of matrices
[3] GEOMETRY AND TRIGONOMETRY
[3].1 Euclidean Geometry
[3].1.1 Properties of angles and lines
[3].1.2 Polygons: triangles, quadrilaterals and general polygons
[3].1.3 Circle: angle properties, cyclic quadrilaterals and intersecting chords
[3].1.4 Construction
[3].2 Mensuration
[3].2.1 lengths and areas of plane geometrical figures
[3].2.2 Lengths of arcs
[3].2.3 Chords of a circle
[3].2.4 Perimeters and areas of sectors
[3].2.5 Segments of circles
[3].2.6 Surface areas and Volumes of simple solids
[3].2.7 Surface areas and Volumes of composite figures
[3].2.8 The earth as a sphere
[3].2.9 Longitudes and Latitudes
[3].2.10 Plane geometric shapes
[3].3 Loci
[3].3.1 locus in 2 dimensions based on geometric principles relating to lines and curves.
[3].4 Coordinate Geometry
[3].4.1 midpoint of a line segment
[3].4.2 Gradient of a line segment
[3].4.3 Distance between two points
[3].4.4 Parallel and perpendicular lines
[3].4.5 Equations of straight lines
[3].5 Trigonometry
[3].5.1 trigonometrical ratios of angles
[3].5.2 Angles of elevation
[3].5.3 Angles of depression
[3].5.4 Bearings
[3].5.5 areas and solutions of triangle
[3].5.6 graphs of sine and cosine
[3].5.7 sine and cosine formulae
[4] CALCULUS
[4].1 Differentiation
[4].1.1 Limit of a function
[4].1.2 differentiation of explicit algebraic and simple trigonometrical functions – sine, cosine and tangent.
[4].2 Application of differentiation
[4].2.1 Rate of change
[4].2.2 Maxima
[4].2.3 Minima
[4].3 Integration
[4].3.1 integration of explicit algebraic
[4].3.2 integration of simple trigonometrical functions
[4].3.3 area under the curve.
[4].3.4 Definite integral
[4].3.5 Indefinite integral
[5] STATISTICS
[5].1 Representation of data
[5].1.1 frequency distribution
[5].1.2 Histogram
[5].1.3 Bar chart
[5].1.4 Pie chart
[5].2 Measures of Location
[5].2.1 Mean of ungrouped and grouped data
[5].2.2 Mode of ungrouped and grouped data
[5].2.3 Median of ungrouped and grouped data
[5].2.4 cumulative frequency
[5].3 Measures of Dispersion
[5].3.1 Range
[5].3.2 Mean deviation
[5].3.3 Variance
[5].3.4 Standard deviation
[5].4 Permutation and Combination
[5].4.1 Linear and circular arrangements
[5].4.2 Arrangements involving repeated objects
[5].5 Probability
[5].5.1 experimental probability (tossing of coin, throwing of a dice etc)
[5].5.2 Addition and multiplication of probabilities (mutual and independent cases).
Jamb Mathematics Questions - Variance
Question 1:
JAMB 2019
Score(x)
0
1
2
3
4
5
6
Freq(f)
5
7
3
7
11
6
7
Find the variance
SchoolNGR Classroom
A
3.42
B
4.69
C
4.85
D
3.72
View Answer & Explanation
Question 2:
JAMB 1995
The variance of the scores 1, 2, 3, 4, 5 is
SchoolNGR Classroom
A
1, 2
B
1, 4
C
2.0
D
3.0
View Answer & Explanation
Question 3:
JAMB 1995
The variance of the scores 1, 2, 3, 4, 5 is
SchoolNGR Classroom
A
1, 2
B
1, 4
C
2.0
D
3.0
View Answer & Explanation
Question 4:
JAMB 1998
Find the variance of the numbers k, k+1, k+2,
SchoolNGR Classroom
A
\(\frac{2}{3}\)
B
1
C
K + 1
D
(k + 1)<sup style='font-size: smaller;'>2</sup>
View Answer & Explanation
Question 5:
JAMB 2000
The variance of x, 2x, 3x, 4x and 5x is
SchoolNGR Classroom
A
X√2
B
2x<sup style='font-size: smaller;'>2</sup>
C
X<sup style='font-size: smaller;'>2</sup>
D
3x
View Answer & Explanation
1
2
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