As the elevation above sea level increase, the corresponding air pressure decrease. A scatterplot comparing elevations, in feet, to air pressure, as a percent of sea level pressure, is shown balow.

Q. Elevations above 8,000 meters are said to be in the "death zone", a range of elevations in which oxygen levels are not high enough to sustain human life. What is the approximate air pressure (as a percent of sea level pressure) at the death zone threshold?( Note: 1 meter=3.28 feet)

Options

A. 0.35
B. 0.5
C. 0.7
D. 0.92

Answer

A

Explanation

Difficult: Hard
Category: Problem Solving and Data Analysis/ Scatterplots
Strategic Advice: when information is presented in a graphic, always read the axis titles and labels carefully, including the units given.
The death zone threshold is given in meters, but elevation is given in feet on the scatterplot. This means you'll need to convert the death zone threshold from meters to feet before doing anything else. Use the factor-label method to assemble a quick calculation:
`8,000times(3.26ft)/(1m)=26,240`ft
Locate 26,240 ft on the x-axis of the scatterplot, and then identify the corresponding pressure on the y-axis, which is 35%. (A) is a correc answer.