Answer:
The variance is 30698.6
Step-by-step explanation:
The billing rates for six dental procedures are listed below:
$663
$273
$410
$622
$174
$374
The mean is given by:
[tex]\bar X=\frac{663+273+410+622+174+374}{6}=\frac{2516}{6}=419.333[/tex]
The variance is given by:
[tex]\sigma^2=\frac{\sum(x-\bar x)^2}{n}[/tex]
[tex]\sigma^2=\frac{(663-419.333)^2+(273-419.333)^2+(410-419.333)^2+(622-419.333)^2+(174-419.333)^2+(374-419.333)^2}{6}[/tex]
[tex]\sigma^2=30698.56[/tex]
Therefore the variance is 30698.6
