The average of 6 observations is 45.5. If one new observation is added to the previous observations, then the new average becomes 47. The new observation is :
A. 58 B. 56 C. 50 D. 46 Answer: Option BShow Answer
Solution(By Apex Team)
$\begin{array}{l}\text{Let the new observation be = x}\\
\text{According to the question,}\\
\text{6 × 45.5 + x = 7 × 47}\\
\text{273.0 + x = 329}\\
\text{x = 329 – 273}\\
\text{x = 56}\end{array}$
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