What is the average (arithmetic mean) of 10,20,30,40,50,60,70,80,90 ?
Choose the correct choice from the following answers
A) 90
B) 95
C) 70
D) 85
E) 50
so addition of all term - 10, 20, 30,.......90   So average = (10+20+30+40+50+60+70+80+90)/9 = (450)/9= 
<gadget id="calculator">(450)/9</gadget>
<output>50</output>
50   Hence, the correct answer is 50.
<result>E</result>
What is the average (arithmetic mean) of 10,20,30,40,50,60,70,80,90 ?