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OpenStudy (anonymous):
A student has the following grades: 80, 76, 78, 83, 83. Find the variance of the grades.
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OpenStudy (anonymous):
find the mean of these numbers..
OpenStudy (dumbcow):
variance is standard deviation squared
OpenStudy (anonymous):
use the formula\[Var(X)=\sum_{i=1}^{n}\frac {(x _{i}-x _{m})^2}{n}\]
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