2 A researcher is investigating the lengths, in kilometres, of the journeys to work of the employees at a certain firm. She takes a random sample of 10 employees.
- State what is meant by 'random' in this context.
The results of her sample are as follows.
$$\begin{array} { l l l l l l l l l l }
1.5 & 2.0 & 3.6 & 5.9 & 4.8 & 8.7 & 3.5 & 2.9 & 4.1 & 3.0
\end{array}$$
- Find unbiased estimates of the population mean and variance.
- State what is meant by 'population' in this context.