<p>For which of the following lists of numbers must the average (arithmetic mean) of the numbers be 20 percent of the sum of the numbers?</p>
<p>I. v and w
II. v, w, x, and y
III. v, w, x, y, and z</p>
<p>A. none
B. I only
C. II only
D. III only
E. II and III</p>
<p>Sum: v + w + x + y + z
Mean: Sum/5</p>
<p>There are 5 terms in III, making the mean 20% of the sum. D is the correct answer.</p>
<p>My answer key says that the answer is C.</p>
<p>Edit: nvm… I looked at it again. Hah, I was originally right. I had marked D but I thought the answer key said C. </p>
<p>Thanks!</p>