Question

Find the arithmetic mean of numbers from $1$ to $9$.

• A. $9$
• B. $5$
• C. $8$
• D. $3$

Answer 1

Answer: (B)

$5$

The numbers from $1$ to $9$ are $1,2,3,4,5,6,7,8,9$

$A.M.=\frac{\text{Sum of observations}}{\text{Number of observations}}=\frac{1+2+3+4+5+6+7+8+9}{9}=\frac{45}{9}=5$