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### Mean Absolute Deviation and Quartiles

Warm - up

- Find the mean of the following number sets.
- 1. 2, 32, 6, 15, 12, 14
- 2. 6, 45, 78, 21, 17, 16
- 3. 7, 3, 1, 8, 4

6.7 and 6.8

Vocabulary

- Measure of dispersion
- A description of the dispersion or the spread of the data

- Range
- The difference between the greatest value and least value

- Deviation from the mean
- Is the difference of a data value and the mean of the data set

- Mean absolute deviation
- Is the average deviation of the data from the mean.

Find the mean absolute deviation

- A) 9, 15, 28, 10, 8
- B) 32, 33, 22, 85, 58

Now You Try

- Find the mean absolute deviation
- A) 105, 98, 95, 100, 95, 107
- B) 36, 39, 58, 42, 106, 39, 48, 45

Vocabulary

- Quartile
- the median of an ordered data set

- Upper Quartile
- the median of the upper half of an ordered set

- Lower Quartile
- the median of the lower half of an ordered set

- Interquartile range
- The difference of the upper quartile and lower quartile

Examples

- Find the mean, median, range, and the interquartile range.
- Data set 1: 102, 105, 108, 110, 112, 113
- Data set 2: 100, 103, 105, 106, 109, 113

Find the mean, median, range, and the interquartile range.

- A) 4, 7, 14, 8, 9
- B) 85, 90, 76, 65, 92, 88

Now You Try

- Find the mean, median, range, and the interquartile range.
- A) 110, 145, 115, 124, 118, 129, 119
- B) 50, 55, 60, 58, 62, 57, 68, 51, 63

Homework

- Page 365 numbers 9-14 all
- Page 372 numbers 1 – 5 all

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