Question

Give the approximate (typical) compression rate of each of the following compressed formats, written as a ratio:

The question is saying write the ratio of the compression rate of the compressed formats of each of the following:
1) A song encoded using mp3:
2) a video encoded using mp4:
3) lossless audio encoded using FLAC:
4) English text encoded using ZIP:

Answer 1

don't most of these have adjustable compression ratios? I guess you'll need to read about each format to find what is "typical" in each case.