Fermi Help Sheet

Number of People on Earth?

Number of People on Earth?

7 billion

How many live in cities?

3.5 billion

Global Median Household Income Per Year

$10,000

Global Life Expectancy

70 years

Average Male Height

175cm

Average Female Height

165cm

The rate people roughly walk at?

4 km/hour (1 m/s)

Top speed of a commercially sold car?

120 km/h (30 m/s)

Speed of a Jet Aircraft

800 km/h (200 m/s)

Speed of Sound Through Air

1200 km/h (300 m/s)

Radius of Earth

6400 km

Top of Mount Everest

8 km above sea level

How much of Earth's surface is covered by water?

70%

Distance to Moon

380,000 km

Distance to Sun

150,000,000 km