The average of 6 observations is 12. A new seventh 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) 8
Explanation:   Seventh observation = (7××11-6××12)=5   5orrect Option: 5
<result>C</result>
The average of 6 observations is 12. A new seventh observation is included and the new average is decreased by 1. The seventh observation is :