Intoduction to the Standard Devarion Section 13: Variabiliy Standard Deviation How to Find Standard Deviation What We Do The Bell Curve What We Did 68, 95, 99.7 Rule Now You Try The standard deviation is a measure of how much scores differ from their mean. 1. Calculate the mean

2. Subtract the mean from each number

3. Square the answer

4. Add all of the squared numbers together

5. Finish the formula Six people in your class took a test worth 20 points. Their scored were 10, 11, 11, 13, 14, 19. Find the Standard Deviation 10+11+11+13+14+19= 78

There are 6 scores so divide 78

by 6 to get a mean of 13 Take each test score and subtract 13 (the average) from it.

10-13= -3

11-13= -2

11-13= -2

13-13= 0

14-13= 1

19-13= 6 Square your answer from step 2.

-3^2= 9

-2^2= 4

-2^2= 4

0^2= 0

1^2= 1

6^2= 36 9+4+4+0+1+36= 54 Take the Square Root of:

Deviations Squared

/

Number of test scores

√(54 ÷ 6)

√9=3 In your group nominate one person to be measured. Find the standard deviation of height in your class (in centimeters), and draw a bell curve.

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# Standard Deviation

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