Dr. J's Maths.com
Where the techniques of Maths
are explained in simple terms.

Data presentation - histograms.
Test Yourself 1.

• Algebra & Number
  • Main Algebra page
  • Equations
    • Blood alcohol (BAC)
  • Factorisation
  • Indices
  • Fractions - algebraic
  • Absolute values
  • Inequalities
  • Irrationals
• Calculus
  • Differentiation
    • Main page
    • Max-min questions
    • Implicit differentiation
  • Integration
    • Main page
    • Approximation methods
    • Areas
    • Volumes
    • Reverse Chain Rule
  • Applics to physical world
  • Historical development
• Financial Maths
  • Main Finance page
  • Earning money & Tax
  • Standard Investments & Loans
  • Series
  • Series - Annuities & Loans
• Functions & Quadratics
  • Main page
  • Characteristics
  • Transformations
  • Linear fns
  • Quadratics
  • Exponential
    • Main page
  • Hyperbola
  • Logarithmic
    • Main page
  • Trigonometric
    • Main page
  • Parametric
  • Inverse functions
    • Inverse fns
    • Inverse trig fns.
• Geometry
  • Parallel lines
  • Triangles
    • Types
    • Congruence
    • Similarity
  • Pythagoras' Theorem
  • Quadrilaterals
  • Circles
    • Arc length, sectors etc
• Measurement
  • Errors of measurement
  • Perimeter & area
  • Surface area & volume
  • Energy and mass
    • Units
    • Food & exercise
    • Electricity
  • Time
    • UTC, GMT & IDL
• Networks & Graphs
• Probability & Statistics
  • Probability main page
  • Data presentation
  • Descriptive statistics
    • Main page
    • Calculator use
  • Probability distributions
  • Normal distribution
  • Binomial distribution
• Trigonometry
  • Measuring angles
    • Main page
  • Equations & identities
  • Graphing trig functions
  • Calculus and trig functions
  • Inverse trig fns
• Maths & beyond
  • Bibliography
  • Maths humour
• Index

 

Basic
Cumulative	Students were surveyed about the number of downloads they did last week. The results are shown in this cumulative frequency histogram. How many students completed four downloads last week?