Solve the Problem $X$ Determine $n , \sum x _ { i }$

Solve the problem. If necessary, round your answer to one more decimal place than that used for the observations.
-A scientist used the following data set showing the weight in pounds gained (or lost) by a sample of eight laboratory animals given Drug $X$ . Determine $n , \sum x _ { i }$ , and $\bar { x }$ .

A)
$\begin{array} { r r r r } 8.9 & - 7.5 & 2.1 & 3.0 \\ - 2.9 & 2.4 & 5.7 & - 5.4 \end{array}$ $\mathrm { n } = 8$ ;
$\begin{array}{l}\sum \mathrm{x}_{i}=6.3 \\\overline{\mathrm{x}}=0.79\end{array}$

B) $\mathrm { n } = 10$ ;
$\begin{array}{l}\sum \mathrm{x}_{i}=6.3 \\\overline{\mathrm{x}}=0.79\end{array}$

C) $\mathrm { n } = 10$ ;
$\begin{array}{l}\sum \mathrm{x}_{i}=6.3 \\\overline{\mathrm{x}}=0.79\end{array}$ .

D) $\mathrm { n } = 8$ ;
$\begin{array}{l}\sum \mathrm{x}_{i}=6.3 \\\overline{\mathrm{x}}=0.79\end{array}$ .