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4.Average
medium
The average of consecutive numbers is $n .$ If the next two consecutive numbers are also included, the average of the five numbers will
A
remain the same
B
increase by $0.5$
C
increase by $1$
D
increase by $1.5$
Solution
Let, the numbers be $n-1, n$ and $n+1$. Their average
$=n$
The next two consecutive numbers are $n+2$ and $n+3$.
Therefore, the average of the five numbers
$=\frac{(n-1)+n+(n+1)+(n+2)+(n+3)}{5}$
$=\frac{5 n+5}{5}$
$=n+1$
Standard 13
Quantitative Aptitude