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

Plot 2 ; Range = 28 m

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Plot 1 ; Range = 6 m

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Plot 3 ; Range = 12 m

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Plot 4 ; Range = 12 m

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Solution

The correct option is B Plot 1 ; Range = 6 m
Tabulating the information from the question, we get:

Depth
(in meters) 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.

$⟹ Range (spread) = 10 - 4 = 6 m$

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