Eleven molecules have speeds 15, 16, 17, . . . , 25 m/s.
OKAY. You have problems here. First of all, you can’t calculate speed because you only have speed. Speed includes direction. Guess someone was a little loose on their terms.
1. for V(moy), find the average speed of the 11 particles. = v1 + v2 + v3…..
2. For Vrms, first square each speed. Then find the mean of the squares. Then take the square root of that number. So rms = root mean square. = sqrt(v1^2 + v2^2 …)