A/D Conversion Quantization in matlab

Hello everyone! I have a lab assignemet involving A/D Conversion Quantization. From what I understood, within signal processing quantizations is defined as the process of mapping input values froma large set, of often continuous, output values into a set of countable finite number of elements.

So I know the commands for Mean of quantization error and Signal-to-noise ratio are

m = errmean(q)
r = snr(x,y)

respectivley.

But I'm not sure how to do this problem. Any advise is welcomed!