6.1.1

Statistics Basics

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Statistics Basics

Statistics can be used to describe a population.

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Mode

  • The mode is the most common value.
  • There may be more than one mode.
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Median

  • The median is the middle value when the values are ordered by size.
  • If there are two middle numbers then the median is the average of these two values.
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Mean

  • The mean is the sum of all the values divided by the number of items.
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Range

  • The range is the difference between the highest and lowest value.

Statistics Basics

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Quartiles

  • The lower quartile, median and upper quartile are the values 25%, 50% and 75% through the dataset.
  • They are written as Q1, Q2, Q3.
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Interquartile range

  • The interquartile range is Q3 - Q1, the difference between the upper and lower quartile.
  • It is a measure of spread, like the range, and is less affected by outliers.
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Outliers

  • Outliers are data values that don’t fit in the same pattern as the rest of the data.

Jump to other topics

1Number

1.1Using Numbers

1.2Fractions, Decimals & Percentages

1.3Powers & Roots

1.4Accuracy

2Algebra

2.1Introduction to Algebra

2.2Manipulating Algebra

2.3Proofs & Functions

2.4Straight Line Graphs

2.5Common Graphs

2.6Transformations & Tangents

2.7Properties of Graphs

2.8Solving Equations

2.9Inequalities

2.10Sequences

3Ratio

4Geometry

4.1Introduction to Geometry

4.2Triangles & Quadrilaterals

4.3Transformations

4.4Circle Basics

4.5Circle Theorems

4.6Measurements & Units

4.7Calculating Area

4.8Triangle Formulae

4.93D Shapes

4.10Vectors

5Probability

6Statistics

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