Fifteen identical particles have various speeds: one has a speed of 2.00 m/s; two have speeds of

Question:

Fifteen identical particles have various speeds: one has a speed of 2.00 m/s; two have speeds of 3.00 m/s; three have speeds of 5.00 m/s; four have speeds of 7.00 m/s; three have speeds of 9.00 m/s; and two have speeds of 12.0 m/s. Find
(a) The average speed,
(b) The rms speed, and
(c) The most probable speed of these particles.