Question

The speed of nitrogen molecules in the atmosphere (at 20ºC) follows a normal distribution with a mean speed of 500 meters/second and a standard deviation of 50 meters/second. Which conclusion does this information best support?

Answer 1

68% mocules have speed between 450 meters and 550 meters

Answer 2

Explanation:

Given that the speed of nitrogen molecules in the atmosphere (at 20ºC) follows a normal distribution with a mean speed of 500 meters/second and a standard deviation of 50 meters/second.

i.e. we get that 68% lie within 1 std deviation from the mean

ie 68%lie between 450 and 550

95% lie between 400 and 600 and

almost 100% lie between 350 and 650