If m is the average (arithmetic mean) of the first 10 positive multiples of 2 and if M is the median of the first 10 positive multiples of 2, what is the value of M – m ? Choose the correct choice from the following answers.
A) –5
B) 0
C) 5
D) 25
E) 27.5
The first 10 positive multiples of 2 is an evenly spaced set. One of the most important properties of evenly spaced set (aka arithmetic progression) is:in any evenly spaced set the arithmetic mean (average) is equal to the median.   Hence M=m --&gt; M-m=0.   Answer: 0.
<result>B</result>
If m is the average (arithmetic mean) of the first 10 positive multiples of 2 and if M is the median of the first 10 positive multiples of 2, what is the value of M – m ?