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Problem 1

 

2.5 Measures of Variability: Range, Standard Deviation, and Variance

Concept
Problem 2
Problem 3
Using the Graphing Calculator
Now You Try It!
Problem 4

Find the Range, Variance, and the Standard Deviation for the following FPL electric bill amounts: (Note, use the following to help speed up the calculations:n = 12, Sum of x = 1698.23, and Sum of X squared = 276,014.86)

Jan-09

$52.28

Feb-09

$91.38

Mar-09

$119.02

Apr-09

$85.74

May-09

$103.44

Jun-09

$163.14

Jul-09

$146.23

Aug-09

$215.94

Sep-09

$204.80

Oct-09

$209.10

Nov-09

$204.80

Dec-09

$102.36
   

What would the units for the standard deviation be in the problem above?   What units would the variance have?


 

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