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7.3 Measures of Central Tendency and Dispersion. Mean – the arithmetic average is the sum of all values in the data set divided by the number of values.

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Presentation on theme: "7.3 Measures of Central Tendency and Dispersion. Mean – the arithmetic average is the sum of all values in the data set divided by the number of values."— Presentation transcript:

1 7.3 Measures of Central Tendency and Dispersion

2 Mean – the arithmetic average is the sum of all values in the data set divided by the number of values. Median – the middle value when the data values are arranged in ascending or descending order. If there are an even # of values then find the mean of the middle 2 values. Mode – the value that is repeated most often from the data. Can be 0, 1 or more than one modes Measures of Central Tendency

3 Measures of Dispersion Standard Deviation : Symbol Range : highest value – lowest value How Spread Out sigma Formula

4 normal curve When we talk about data, often times it falls on what we call a normal curve.

5 Standard Deviation This gives us a picture of how the Standard Deviation can tell us how an individual value relates to the bulk of the data.

6 Find the, median, mode and range for the following data. 40, 45, 39, 40, 42, 41, 37, 41, 40, 41

7 40, 45, 39, 40, 42, 41, 37, 41, 40, 41 Now let’s find the standard deviation.

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