The arithmetic mean of the 13 consecutive integers starting with 's' is 'a'. What is the arithmetic mean of 9 consecutive integers that start with s + 6? Select the correct option:
A) 2 + s + a
B) 22 + a
C) 2s
D) 2a + 2
E) a
(13s+78)/13=s+6=a   (9s+54)/9=s+6=a   a
<result>E</result>
The arithmetic mean of the 13 consecutive integers starting with 's' is 'a'. What is the arithmetic mean of 9 consecutive integers that start with s + 6?