Question

A submarine records the water pressure at every 2 metres below the sea on a line plot. If the pressure increases by 1 unit for every 2 metres and if the submarine records 4 observations, starting at a depth of 4 metres, find the correct line plot and range for the data.

• A. Plot 2 ; Range = 28 m
• B. Plot 3 ; Range = 12 m
• C. Plot 1 ; Range = 6 m
• D. Plot 4 ; Range = 12 m

Answer 1

The correct option is C Plot 1 ; Range = 6 m

Tabulating the information from the question, we get:

Depth (in metres)	Water pressure (in pressure units)
4	2
6	3
8	4
10	5

Plotting this data on a line plot, we get:


Range is the difference between the highest observation and the lowest observation.

$⟹\text{Range (spread)}=10-4=6m$