Probability question...velocities of a molecule

[Guest]

The velocities of a group of molecules are normally distributed. When the velocities are put on a scale from 0 to 6, the mean is 3 and the standard deviation is 1. If the minimum energy of activation of a certain reaction is found to be 5, what percent of the molecules will be able to react (v >=5)?

 

[stapel]

Your book should have a graphic somewhere that marks off "this much of the data falls within one standard deviation of the norm, this much within two, and this much within three". Just work from that. :wink:

Eliz.

 

[stapel]

This is what I meant. (And "thank you!" to galactus for posting the graphic.)

Eliz.