What is the minimum percentage increase in the mean of set A {-4, -1, 0, 6, 9} if its two smallest elements are replaced with two different primes?  Pick one.
A) 25%  B) 50%  C) 75%  D) 100%  E) 200%
Mean of A is (-4-1+0+6+9)/5= 
<gadget id="calculator">(-4-1+0+6+9)/5</gadget>
<output>2</output>
2;   In order the increase to be minimal we should replace two smallest elements of A, which are -4 and -1, with two smallest primes, which are 2 and 3. Hence our new set will be {2, 3, 0, 6, 9} --&gt; new mean is   (2+3+0+6+9)/5= 
<gadget id="calculator">  (2+3+0+6+9)/5</gadget>
<output>4</output>
4.   Percent increase=(4-2)/2*100= 
<gadget id="calculator">(4-2)/2*100</gadget>
<output>100</output>
100%.   Answer: 100%.
<result>D</result>
What is the minimum percentage increase in the mean of set A {-4, -1, 0, 6, 9} if its two smallest elements are replaced with two different primes?