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?
A 84% of the molecules have speeds between 450 meters/second and 550 meters/second.
b 68% of the molecules have speeds between 450 meters/second and 550 meters/second.
c 50% of the molecules have speeds between 450 meters/second and 550 meters/second.
d 34% of the molecules have speeds greater than 550 meters/second.

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?
A 84% of the molecules have speeds between 450 meters/second and 550 meters/second.
b 68% of the molecules have speeds between 450 meters/second and 550 meters/second.
c 50% of the molecules have speeds between 450 meters/second and 550 meters/second.
d 34% of the molecules have speeds greater than 550 meters/second.

anonymous · Answer

B

anonymous · Answer

Which assumption will work best for a large data set with a normal distribution?
A Most of the data points are close to the minimum value of the set.
B Most of the data points are close to the maximum value of the set.
C Most of the data points are close to the mean value of the set.
D The data points are distributed uniformly over the range of the set.