Question

Help me out on this question please I do t understand .

Answer 1

The mean of a set of data can be found through the formula

`\bar{x}=(\sum ^n_(i\mathop=0)x_i)/(n)`

then, the mean water level can be found as

`\begin{gathered} \bar{x}=(7+2+8+7+2+8+6+5+9)/(9) \\ \bar{x}=(54)/(9) \\ \bar{x}=6 \end{gathered}`