A certain set of numbers has an average (arithmetic mean) of 50 and a standard deviation of 50.5. If b and n, two numbers in the set, are both within 2 standard deviations from the average, then which of the following could be the sum of b and n?	Choose the correct choice from the following options:
A) -200
B) -130
C) -104
D) 51
E) 305
2 standard deviations from the average is frommean - 2*SDtomean + 2*SD, thus from 50-2*50.5=51 to  50+2*50.5= 
<gadget id="calculator"> 50+2*50.5</gadget>
<output>151</output>
151:   -51 &lt; b &lt; 151   -51 &lt; n &lt; 151   -102 &lt; b+n &lt; 302.   Only option D is in this range.   Answer: 51.
<result>D</result>
A certain set of numbers has an average (arithmetic mean) of 50 and a standard deviation of 50.5. If b and n, two numbers in the set, are both within 2 standard deviations from the average, then which of the following could be the sum of b and n?