What is the average (arithmetic mean) of all the multiples of ten from 10 to 200 inclusive?  Choices: A) 90 B) 95 C) 100 D) 105 E) 110
10 and 190 inclusive would mean there are 19 terms.   No need to add up all the terms and further divide by 20 since the terms are evenly spaced in ascending order from 10, 20, 30........200   The middle term is the average which is the tenth term = 110   110 is the answer.
<result>E</result>
What is the average (arithmetic mean) of all the multiples of ten from 10 to 200 inclusive?