Grouped Data 3012 - Grouped Data 1. 3012 A class of 40...

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Grouped Data 3012 Now read this : When we have a wide range of data, it is convenient to organise the data into classes . These show a range of data. It is less accurate to use classes, because the exact value of the data is lost. However, it can save a lot of work. Making a tally can help reduce mistakes. When data is in classes it is easy to see the modal class . This is the class with the highest frequency. Also, the class which contains the median is called the median class . Read carefully though this example. Make sure that you understand. 1. A class of 40 students took a mock exam in maths. They were given percentage marks as follows: 73, 45, 62, 34, 59, 20, 48, 50, 78, 38, 52, 91, 57, 82, 46, 51, 62, 58, 39, 50, 72, 73, 63, 52, 41, 37, 28, 46, 71, 75, 36, 28, 44, 90, 51, 28, 60, 18, 47, 40. (a) Make a table that shows the results more clearly. (b) The teacher wants to compare the marks with those of another class. Suggest a way that she can organise the results to make it easy to compare. (c)
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This note was uploaded on 08/12/2011 for the course AS 211 taught by Professor Yuceltandogdu during the Spring '11 term at Eastern Mediterranean University.

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Grouped Data 3012 - Grouped Data 1. 3012 A class of 40...

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