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# Measures of Central Tendency

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### Measures of Central Tendency

1. 1. Create a stem and leaf plot for the following data:<br />The data below contain the first quarter grade of 12 randomly selected students in Data Analysis:<br />80 90 95 83 73 69<br /> 75 86 91 84 75 67<br />Warm Up # 14 <br />
2. 2. http://www.bls.gov/oco/ocos041.htm<br />Median and Average Salary for Actuary<br />
3. 3. 12.2 Measures of Central Tendency (p.644) <br />Mean, Median, Mode and Midrange<br />
4. 4. Obtained by adding all the data items and then dividing the sum by the number of items<br />Formula: ∑ x / n<br />-<br />Mean<br />
5. 5. The middle set or ranked or ordered data<br />To find the median, arrange the data from smallest to largest<br />If the number of data items is odd, the median is the item in the middle of the list.<br />If the number of data items is even, the data is the average of the two middle numbers.<br />Median <br />
6. 6. The data value that occurs most often in the data set. <br />If no data items are repeated, then the data set has no mode.<br />If more than one value has the highest frequency, then each of the data is a mode.<br />Mode<br />
7. 7. Found by adding the lowest and highest data values and dividing the sum by 2.<br />Midrange = lowest + highest<br /> 2<br />Midrange<br />
8. 8. Checkpoints 1, 3, 5, 9, 10 p. 646-654<br />Assessment<br />
9. 9. Table 12.5 on p. 646<br />Checkpoint 2<br />Measures of Central Tendency given a Frequency Distribution<br />