Bandwidth is the difference between the upper and lower frequencies in a continuous band of frequencies.
Mathematically can be expressed as,
[tex]BW = F_{c2}-F_{c1}[/tex]
The upper frequency is 88Hz and the lower frequency is 6, therefore the Bandwidth would be,
[tex]BW = (88-5)kHz[/tex]
[tex]BW = 83kHz[/tex]
The center frequency is given on the basis of the square root of the multiplication of the two reference frequencies, then,
[tex]f_0 = \sqrt{f_{c1}*f_{c2}}[/tex]
[tex]f_0 = \sqrt{88*5}[/tex]
[tex]f_0 = 20.97kHz[/tex]
