Which of the following statements is true about the Maxwell speed distribution?

a. A higher proportion of molecules have the root-mean-square speed than the average speed.
b. A molecule of gas moving at the most probable speed has more kinetic energy than does the same molecule moving at the average speed.
c. The mean speed and root-mean-square speed are different names for the same value.
d. The distribution of molecules from largest to smallest goes 1) most probable speed, 2) mean speed, 3) root-mean-square speed.

d.
The speeds are indeed in that following order for an ideal gas at any temperature within the classical limit.

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