The average of 6 observations is 16. A new observation is included and the new average is decreased by 1. The seventh observation is?  Pick one:  A) 1  B) 3  C) 9  D) 6  E) 7
Let seventh observation = X.   Then, according to the question we have   =&gt; (96 + X) / 7 = 15   =&gt; X = 9   Hence, the seventh observation is 9.   ANSWER:9
<result>C</result>
The average of 6 observations is 16. A new observation is included and the new average is decreased by 1. The seventh observation is?