Therefore,
We know that ,all the numbers from \[7\]to $17$are:
$7,8,9,10,11,12,13,14,15,16,17$
Whereas n is the total number,
$N=11$
Then,
$\bar{x}=(x1+x2+…xn)/n$
$\bar{x}=(7+8+9+10+11+12+13+14+15+16+17)/11$
$\bar{x}=132/11$
$\bar{x}=12$
Hence, its mean of all numbers from $7$ to $17$ is $12$