Finite Math Examples

Find the Sample Standard Deviation 1/2 , 3/4 , -1 , 0 , 7
, , , ,
Step 1
Find the mean.
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Step 1.1
The mean of a set of numbers is the sum divided by the number of terms.
Step 1.2
Simplify the numerator.
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Step 1.2.1
To write as a fraction with a common denominator, multiply by .
Step 1.2.2
Write each expression with a common denominator of , by multiplying each by an appropriate factor of .
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Step 1.2.2.1
Multiply by .
Step 1.2.2.2
Multiply by .
Step 1.2.3
Combine the numerators over the common denominator.
Step 1.2.4
Add and .
Step 1.2.5
To write as a fraction with a common denominator, multiply by .
Step 1.2.6
Combine and .
Step 1.2.7
Combine the numerators over the common denominator.
Step 1.2.8
Simplify the numerator.
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Step 1.2.8.1
Multiply by .
Step 1.2.8.2
Subtract from .
Step 1.2.9
Add and .
Step 1.2.10
To write as a fraction with a common denominator, multiply by .
Step 1.2.11
Combine and .
Step 1.2.12
Combine the numerators over the common denominator.
Step 1.2.13
Simplify the numerator.
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Step 1.2.13.1
Multiply by .
Step 1.2.13.2
Add and .
Step 1.3
Multiply the numerator by the reciprocal of the denominator.
Step 1.4
Multiply .
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Step 1.4.1
Multiply by .
Step 1.4.2
Multiply by .
Step 1.5
Divide.
Step 1.6
The mean should be rounded to one more decimal place than the original data. If the original data were mixed, round to one decimal place more than the least precise.
Step 2
Simplify each value in the list.
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Step 2.1
Convert to a decimal value.
Step 2.2
Convert to a decimal value.
Step 2.3
Convert to a decimal value.
Step 2.4
Convert to a decimal value.
Step 2.5
Convert to a decimal value.
Step 2.6
The simplified values are .
Step 3
Set up the formula for sample standard deviation. The standard deviation of a set of values is a measure of the spread of its values.
Step 4
Set up the formula for standard deviation for this set of numbers.
Step 5
Simplify the result.
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Step 5.1
Subtract from .
Step 5.2
Raise to the power of .
Step 5.3
Subtract from .
Step 5.4
Raise to the power of .
Step 5.5
Subtract from .
Step 5.6
Raise to the power of .
Step 5.7
Subtract from .
Step 5.8
Raise to the power of .
Step 5.9
Subtract from .
Step 5.10
Raise to the power of .
Step 5.11
Add and .
Step 5.12
Add and .
Step 5.13
Add and .
Step 5.14
Add and .
Step 5.15
Subtract from .
Step 5.16
Divide by .
Step 6
The standard deviation should be rounded to one more decimal place than the original data. If the original data were mixed, round to one decimal place more than the least precise.