MATLAB: I need to find out the bit rate of following?Whether it is correct way to do it or not? Thanks in advance

Question

Bit rate=(file size*8000)/length of signal;

Bit rate=(4.4922kb*8000)/28.68sec;

and the answer is 1253.05 bits per second but I need to find out bit rate in terms of bits per sample ,how do I calculate it?

Answer 1

File size in bytes times 8 bits per byte, divide by number of samples, divide by number of channels.

The bits per sample is independent of the sampling frequency.