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Find the Variance 24 , 84
,
Step 1
The
mean
of a
set
of numbers is the
sum
divided by the number of
terms
.
Step 2
Cancel the
common factor
of and .
Factor
out of .
Factor
out of .
Factor
out of .
Cancel the
common factors
.
Factor
out of .
Cancel the
common factor
.
Rewrite the
expression
.
Divide
by .
Step 3
Add and .
Step 4
Set
up the
formula
for variance. The variance of a
set
of values is a
measure
of the spread of its values.
Step 5
Set
up the
formula
for variance for this
set
of numbers.
Step 6
Simplify the result.
Simplify the
numerator
.
Subtract from .
Raise to the
power
of .
Subtract from .
Raise to the
power
of .
Add and .
Simplify the
expression
.
Subtract from .
Divide
by .
Step 7
Approximate
the result.
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