Question 1

A survey was conducted by a group of students as a part of their environment awareness programme, in which they collected the following data regarding the number of plants in 20 houses in a locality. Find the mean number of plants per house.

$$\begin{array}{|c|c|c|c|c|c|c|c|}

\hline
\text{Number of plants} & 0 - 2 & 2 - 4 & 4 - 6 & 6 - 8 & 8 - 10 & 10 - 12 & 12 - 14 \\
\hline
\text{Number of houses} & 1 & 2 & 1 & 5 & 6 & 2 & 3 \\
\hline
\end{array}$$

Which method did you use for finding the mean, and why?