Presentations are a powerful communication medium.

1

For more than 20 years, Duarte has developed presentations2

to launch products, 3

align employees, 4

increase company value,5

and propel6

Learning MATH is FUN

global causes.7

MATH

Along the way weve discovered8

Live.Love.Learn MATH

BE HAPPY!WELCOME

MATH

five simple rules for creating world-changing presentations.9

MATH

MEANDEVIATION

(for ungrouped data)

The first rule is: Treat your audience as king.10

MATH

Definition:The MEAN DEVIATION, or average deviation, is the dispersion of the data about the mean of these data.

MATH

Definition:The MEAN DEVIATION is a measure of variation that makes use of all the scores of the distribution.

MATH

RangeVSMean DeviationThe MEAN DEVIATION is more reliable than the RANGE.?

MATH

FormulaM.D. = |x x| n(for ungrouped data)

where x is the scores of the distributionx is the meann is the number of observations

Steps1. Find the mean of thescores.2. Find the absolute difference between each score and the mean.3. Get the sum of the absolute differences.4. Divide it by n.

Ex. 1Find the mean deviation of the given set of data.85 96 76 108858085 1007095

Ex. 2Find the mean deviation of the given set of data.3 13 11 11 5 42

YouCanDo It!Work-In-Pair Two Heads Are Better Than OneFind the mean deviation.1. Science achievement test scores: 60, 75, 80, 85, 90, 952. Height (in cm) of five grade 7 students: 150, 154, 148, 156, 150

HOMEWORKLearning is fun! Answer the following.1. Define STANDARD DEVIATION.2. What are the steps in computing the standard deviation for ungrouped data?