A set has exactly five consecutive positive integers starting with 1. What is the percentage decrease in the average of the numbers when the greatest one of the numbers is removed from the set?
Choose one:
A) 8.54 B) 12.56 C) 15.25 D) 16.66 E) None of these
Explanation :   The average of the five consecutive positive integers 1,2,3,4 and 5 is:   (1+2+3+4+5)/5=15/5= 
<gadget id="calculator">15/5</gadget>
<output>3</output>
3.   After removing the the greatest number i.e 5, the new average becomes:   (1+2+3+4)/4=104=2.5.   Now, % drop in the average =(Old average – New average)×100/Old average.   =&gt;(3−2.5)×100/3.   =&gt;100/6=16.66.   Answer : 16.66
<result>D</result>
A set has exactly five consecutive positive integers starting with 1. What is the percentage decrease in the average of the numbers when the greatest one of the numbers is removed from the set?