- Stav is studying the large data set for September 2015
He codes the variable Daily Mean Pressure, \(x\), using the formula \(y = x - 1010\)
The data for all 30 days from Hurn are summarised by
$$\sum y = 214 \quad \sum y ^ { 2 } = 5912$$
- State the units of the variable \(x\)
- Find the mean Daily Mean Pressure for these 30 days.
- Find the standard deviation of Daily Mean Pressure for these 30 days.
Stav knows that, in the UK, winds circulate
- in a clockwise direction around a region of high pressure
- in an anticlockwise direction around a region of low pressure
The table gives the Daily Mean Pressure for 3 locations from the large data set on 26/09/2015
| Location | Heathrow | Hurn | Leuchars |
| Daily Mean Pressure | 1029 | 1028 | 1028 |
| Cardinal Wind Direction | | | |
- Using your knowledge of the large data set, place each of these Cardinal Wind Directions in the correct location in the table.
Give a reason for your answer.
\section*{Question 3 continued.}