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Covers the whole of the National 5 Maths course

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Resources used with students studying Maths in Scottish Secondary Schools

Understanding Standard Deviation is important to ensure your success in tests, assessments and exams.

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_________________ | _______________________ |

Exam Ques 1 | Standard Deviation |

Exam Ques 3 (N5) | Standard Deviation |

Exam Ques 3 (N5) | Standard Deviation (P1, Q5) |

Mind Map 1 | Comparing Data |

Mind Map 2 | Comparing Data (PowerPoint) |

Mind Map 3 | Standard Deviation |

Mind Map 4 | Standard Deviation (PowerPoint) |

A Standard Deviation exam question is shown below:

*The standard deviation of 1, 2, 2, 2, 8 is equal to √a. Find the value of a*

Source: 2015 N5 Maths, P1, Q5

You are given two formulas in the exam:

Standard Deviation:

*Is a reliable measure of spread since all the statistics are used in its calculation.**Measures the average deviation (difference) of each statistic from the mean (average)*

The larger the Standard Deviation value, the larger the spread.

Finding the Standard Deviation involves a process of drawing a table to determine what to substitute into the above formula.

You are often asked to compare the mean and standard deviation with a different data set and make comments.

*Mean – should include statements like ‘on average’**Standard deviation – should include words like ‘spread’, ‘consistent’ and ‘varies’*

We cover everything you need to know about Standard Deviation in the Study Guides.

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