The average of 6 observations is 12. A new observation is included and the new average is decreased by 1. The seventh observation is?
Pick one:	A) 1	B) 3	C) 5	D) 6	E) 7
Let seventh observation = X.   Then, according to the question we have   =&gt; (72 + X) / 7 = 11   =&gt; X = 5.   Hence, the seventh observation is 5.   ANSWER:5
<result>C</result>
The average of 6 observations is 12. A new observation is included and the new average is decreased by 1. The seventh observation is?