A factory worker is paid at a daily rate of $\$10$ per hour for the first forty hours of work per week and $\$15$ per hour for any extra time (overtime).

Write down an equation for the money earned during the first forty hours.

A factory worker is paid at a daily rate of $\$10$ per hour for the first forty hours of work per week and $\$15$ per hour for any extra time (overtime).

Write down an equation for the money earned on overtime.

A factory worker is paid at a daily rate of $\$10$ per hour for the first forty hours of work per week and $\$15$ per hour for any extra time (overtime).

Draw a graph for the wages earned during a $60$ hour working week.

A ski resort saw snow fall at a rate of $6 \mathrm{cm}$ per hour for the first two hours and then at $4 \mathrm{cm}$ per hour for the next three hours.

Draw a graph to show the snowfall.

A ski resort saw snow fall at a rate of $6 \mathrm{cm}$ per hour for the first two hours and then at $4 \mathrm{cm}$ per hour for the next three hours.

Write down the maximum and minimum values that Pearson's product-moment correlation coefficient $r$ can take.

Choose two words from the list below which best describe the correlation between $x$ and $y$ in scatter diagram: perfect, zero, linear, strong positive, strong negative, weak positive, weak negative.

Kasem recorded the average monthly outside temperature $($in $\left.{}^{\circ }\mathrm{C}\right)$ and the cost of his monthly electricity bill (in hundreds of Dirhams) over the course of six months. His results are shown in the table.

Plot this data on a scatter diagram

Kasem recorded the average monthly outside temperature $($in $\left.{}^{\circ }\mathrm{C}\right)$ and the cost of his monthly electricity bill (in hundreds of Dirhams) over the course of six months. His results are shown in the table.

Find the mean outside temperature over the six months.