72 percent of the atmosphere is below the common cruising altitude of commercial airliners (about 10,000 m or 32,800 ft). 99.99999 percent of the atmosphere is below the highest flight altitude of the aircraft X-15, which reached 354,300 ft (108 km) on August 22, 1963.
Answer: ____________________________________________________________ The variable is QUANTITATIVE—since it is a measurable (numeric) value. ____________________________________________________________
