The mean of $19$ observations is $4 .$ If one more observation of $24$ is added to the data, the new mean will be
$4$
$5$
$6$
$7$
The average of three numbers is $154 .$ The first number is twice the second and the second number is twice the third. The first number is
The average age of four brothers is $12 \,year.$ If the age of their mother be also included, the average is increased by $5\, year.$ The age of the mother (in $years$) is
The average of prime numbers between $1$ and $20$ is
The average age of Donald, his wife and their two children is $23\, years.$ His wife is just $4 \,year$ younger than Donald himself andxhis wife was $24\, years$ old when his daughter was born. He was $32 \,years$ old when his son was born. Th average age of Donald and his daughter is ? (in $year$)
The average of $5$ consecutive integers starting with $m$ is $n$. What is the average of $6$ consecutive integers starting with $( m +2) ?$