fft windowing - how to get frequency vector of one window

I have wav file, I'm doing 0.1 second windowing without overlapping. I'm doing fft on each window and I need to record the mean of responses for frequencies between 2 and 3 KHZ, but I don't know how to extract responses for frequencies from 2 to 3 KHZ and average them, below is my code

fileName = 'me3.wav';
[x, fs] =  audioread(fileName);
dt = 1/fs;
t = [0:length(x)-1]*dt;
figure(1);
plot(t,x);
Nfft = length(x);
f= [0 : Nfft-1 ]/Nfft*fs;
sizeOfWindow = fs*0.1; %4410 = fs*0.1
start =1;
k = 1;
while(((start+sizeOfWindow)-1)<=Nfft)
    j=1;
    i =start;
    while(j<=sizeOfWindow)
        WindowArray(j) = x(i);
        j = j+1;
        i = i +1;
    end
    Y = abs(fft(WindowArray));
    %%%here I need to extract part of Y which corresponds to frequencies from 2- 3 KHZ %%%
    resp(k)= mean(Y);
    start = start + sizeOfWindow;
    k = k+1;
    end

please see my comment inside code and help me how to achieve that