1. The problem statement, all variables and given/known data The speed of a group of molecules are 2, 3 , ..... 11 km/sec. find the average speed of the group and also find the R.M>S speed of the group ? 2. Relevant equations 3. The attempt at a solution by summation of all 2+3+4+... 11 / 11 . is it right ... and how i find RMS speed.