[RESOLVED] Help with simple Array program

[sbstn26]

I got this from a book.:
Forty students were asked to rate the quality of the food in the student cafeteria on a scale of 1 to 10 (1 means awful and 10 means excellent). Place the 40 responses in an Integer array and summarize the results of the poll.

The form has a command button named cmdPrint. Here is the code:

Option Explicit
Option Base 1
Dim mResponses(40) As Integer

Private Sub Form_Load()
 Dim x As Integer
 
 For x = LBound(mResponses) To UBound(mResponses)
  mResponses(x) = 1 + Int(Rnd * 10)
 Next x
End Sub

Private Sub cmdPrint_Click()
 Dim frequency(10) As Integer '10 elements
 Dim x As Integer
 
 Call Cls
 Call Randomize
 
 'Calculate results
 For x = LBound(mResponses) To UBound(mResponses)
  frequency(mResponses(x)) = frequency(mResponses(x)) + 1
 Next x
 Print "Rating" & Space(3) & "Frequency"
 For x = LBound(frequency) To UBound(frequency)
  Print Space(3) & x & vbTab & vbTab & frequency(x)
 Next x
 cmdPrint.Enabled = False
End Sub

I don't understand the logic of this line:
frequency(mResponses(x)) = frequency(mResponses(x)) + 1
I've read the book's explanation over and over but I still don't get it.
Here is what the book says: "This statement increments the appropriate frequency counter depending on the value of mResponses(x). For example, when the counter x is 1, mResponses(x) is 1, so frequency(mResponses(x) is actually interpreted as frequency(1) = frequency(1) + 1 which increments array index one...." I don't understand it! How does this statement calculate the frequency of a response??

Many thanks guys!!!