The average of 6 observations is 11. A new observation is included and the new average is decreased by 1. The seventh observation is?	Pick one:  A) 4  B) 3  C) 5  D) 6  E) 7
Let seventh observation = X.   Then, according to the question we have   =&gt; (66 + X) / 7 = 10   =&gt; X = 4.   Hence, the seventh observation is 4.   4NSWER:4
<result>A</result>
The average of 6 observations is 11. A new observation is included and the new average is decreased by 1. The seventh observation is?