5.1.7

Sum of Probabilities

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Sum of Probabilities

If all the possible outcomes of an event are listed then the sum of the probabilities of those events will be 1.

Probabilities add up to 1

Probabilities add up to 1

  • For any event:
    • P(event happens) + P(event doesn’t happen) = 1.
Rules

Rules

  • The probabilities of a set of outcomes add up to 1 if:
    • All possible outcomes are included
    • Only one outcome can happen at a time.
Jump to other topics
1

Number

1.1

Place Value

1.2

Factors & Multiples

1.3

Operations

1.4

Fractions, Decimals & Percentages

1.5

Growth & Decay

1.6

Measurements & Units

1.7

Accuracy

2

Algebra

2.1

Introduction to Algebra

2.2

Graphs

2.3

Solving Equations

2.4

Sequences

3

Ratio, Proportion & Rates of Change

4

Geometry & Measures

4.1

Introduction to Geometry

4.2

Ruler & Compass Constructions

4.3

Perimeter & Area

4.4

Triangles, Quadrilaterals & Circles

4.5

Transformations

4.6

Triangle Formulae

4.7

3D Shapes

4.8

Vectors

5

Probability

6

Statistics

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