7.2 Averages

7.2.1 Mean, median and mode

The mean, median and mode are all types of average and are typical of the data they represent. Each has advantages and disadvantages, and can be used in different situations, but they all give us an idea of the general size of the values involved. Here we provide brief definitions, and some idea of when each should be used.

The following set of data i
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January 29, 2013 — Japanese researchers, using cameras strapped to the backs of Adelie penguins in Antarctica, showed a perfect success rate at catching prey underwater. (02:02)
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4.2 Job analysis

Job analysis involves examining a job systematically and in detail. There is no single way of doing this. Direct observation may be helpful if you are analysing repetitive manual jobs, for example. Discussion with the current job holder and supervisor or line manager is also a useful source of information. Another method of job analysis is to use the checklist approach illustrated in Author(s): The Open University

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5 Example of a straightforward subtraction

In the example below of a straightforward subtraction, in every column the digit at the top of the column is bigger than the digit at the bottom. Click on each step in turn to see how to carry out the calculation.

Active content not displayed. This content requires JavaScript to be enabled, and a recent version of Author(s): The Open University

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1.2 Habitudes et projets

What do people normally do on 14 July? And this year, will they all enjoy the celebrations or will some of them have good reasons for not getting involved?

Activité 5 LE QUATORZE JUILLET 11:17–15:30

1 Regardez la séquence
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