model 1 basic average questions Section-Wise Topic Notes With Detailed Explanation And Example Questions

Question : 1

If the average of x and $1/x (x ≠ 0)$ is M, then the average of $x^2$ and $1/x^2$is :

a) $1-M^2$

b) $1-2M$

c) $2M^2-1$

d) $2M^2+1$

Question : 2

If the average of m numbers is $n^2$ and that of n numbers is $m^2$, then average of (m + n) numbers is

a) $m/n$

b) m+n

c) mn

d) m-n

Question : 3

Numbers of boys and girls are ‘x’ and ‘y’ respectively. Ages of a girl and a boy are ‘a’ years and ‘b’ years respectively. The average age (in years) of all boys and girls is

a) $\text"x+y"/\text"bx+ay"$

b) $\text"x+y"/\text"bx+ay"$

c) $\text"bx+ay"/\text"x+y"$

d) $\text"x+y"/\text"ax+by"$

Question : 4

If a, b, c, d, e are five consecutive odd numbers, their average is

a) $5(a+4)$

b) $\text"abcde"/5$

c) $5(a+b+c+d+e)$

d) $a+4$

Question : 5

The average of 5 consecutive integers starting with ‘m’ is n. What is the average of 6 consecutive integers starting with (m + 2) ?

a) $\text"2n+5"/2$

b) $n+2$

c) $n+3$

d) $\text"2n+9"/2$

Question : 6

The average of nine consecutive numbers is n. If the next two numbers are also included the new average w

a) increase by 2

b) remain the same

c) increase by 1.5

d) increase by 1