help me, this is so confusing

the following set of​ numbers, find the​ mean, median, mode and midrange.
9​, 9​, 10​, 11​, 13​, 13​, 13​, 14​, 25
Question content area bottom
Part 1
The​ mean, x​, is the sum of the data divided by the number of pieces of data. The formula for calculating the mean is x=
Σx
n​, where Σx represents the sum of all the data and n represents the number of pieces of data.
Part 2
First find the sum of all the​ data, Σx.
Σx
=
9+9+10+11+13+13+13+14+25
=
117117
Part 3
​Second, find the number of pieces of​ data, n.
The number of pieces of data listed is enter your response here.