Question : The average of 5 consecutive integers starting with 'm' is n. What is the average of 6 consecutive integers starting with (m + 2)?
Option 1: $\frac{2n+5}{2}$
Option 2: $(n+2)$
Option 3: $(n+3)$
Option 4: $\frac{2n+9}{2}$
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Correct Answer: $\frac{2n+5}{2}$
Solution : Average of 5 consecutive integers starting with 'm' = n Let m, m + 1, m + 2, m + 3, m + 4 be the 5 consecutive integers. Average of 5 consecutive integers = middle term $n$ = m + 2---------------------------------(i) Then 6 consecutive integers starting with (m + 2) ⇒ m + 2, m + 3, m + 4, m + 5, m + 6, m + 7 From equation (i), ⇒ $n, n+1, n+2, n+3, n+4, n+5$ Average of 6 consecutive integers = average of two middle terms = $\frac{(n+2)+(n+3)}{2}$ = $\frac{(2n+5)}{2}$ The average of 6 consecutive integers starting with (m + 2) is $\frac{(2n+5)}{2}$. Hence, the correct answer is $\frac{(2n+5)}{2}$.
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