What is the average (arithmetic mean) of the numbers 16, 17, 18, 19 and 20?
Choices
A) 14.2	B) 16.5	C) 17	D) 17.5	E) 18
{16, 17, 18, 19, 20}={18-2,18-1, 18, 18+1,18+2} --&gt; the average = 18.   Answer: 18.
<result>E</result>
What is the average (arithmetic mean) of the numbers 16, 17, 18, 19 and 20?