A certain characteristic in a large population has a distribution that is symmetric about the mean a. If 68% of the distribution lies one standard deviation d of the mean, what percent of the distribution is less than a+d?	Answers
A) 16%
B) 32%
C) 48%
D) 84%
E) 92%
16%   ________________________________________________ a+d   34%   ________________________________________________ a   34%   ________________________________________________ a-d   16%   since 68% lies one standard deviation from mean a, =&gt; 50% of 68% lies on either side as it is symmetric about a.   thus 16% lie below a-d and 16% lie above a+d   now below a+d = 16+34+34= 
<gadget id="calculator">16+34+34</gadget>
<output>84</output>
84%   hence 84%
<result>D</result>
A certain characteristic in a large population has a distribution that is symmetric about the mean a. If 68% of the distribution lies one standard deviation d of the mean, what percent of the distribution is less than a+d?