Find the variance for the given data. Round your answer to one more decimal place than the original data.
-$$\begin{array} { l l l l l }
- 1 & 7 & - 11 & 7 & 8
\end{array}$$
A) 66.0
B) 65.9
C) 66.8
D) 52.8

Question

Find the variance for the given data. Round your answer to one more decimal place than the original data.
-$$\begin{array} { l l l l l } 
- 1 & 7 & - 11 & 7 & 8
\end{array}$$
A) 66.0
B) 65.9
C) 66.8
D) 52.8

Quizplus · Accepted Answer

To find the variance, first calculate the mean: $(-1 + 7 - 11 + 7 + 8)/5 = 2$. Then, find the squared differences from the mean: $((-1-2)^2, (7-2)^2, (-11-2)^2, (7-2)^2, (8-2)^2) = (9, 25, 169, 25, 36)$. The variance is the average of these squared differences: $(9 + 25 + 169 + 25 + 36)/5 = 66.8$.

Find the Variance for the Given Data −17−1178\begin{array} { l l l l l } - 1 & 7 & - 11 & 7 & 8\end{array}−1​7​−11​7​8​

Find the Variance for the Given Data $\begin{array} { l l l l l } - 1 & 7 & - 11 & 7 & 8\end{array}$