Units, compression and boot

Questions 1 to 5 of 10

1. 1. A file is 2 GB in decimal units. The link runs at 80 Mbps. About how many seconds does the download take, ignoring overheads?

   25 seconds1,600 seconds200 seconds20 seconds
2. 2. What does this code print? ``python size = 3_000_000 print(f"{size / 1024:,.1f} KiB") ``

   2,929.7 KiB2,929.7 KB3,000.0 KiB3,051.8 KiB
3. 3. Binary prefixes such as KiB and MiB step up from one unit to the next by what factor? Write the number.

   Type your answer.

4. 4. True or false: a link rated at 100 Mbps delivers 100 MB of data every second.

   True, because Mbps and MB both count bytes, so 100 of one is 100 of the otherFalse, because a byte is 8 bits, so 100 Mbps is about 12.5 MB per second
5. 5. This code reads the words of a sentence and builds codes the way a dictionary-style compressor does. What does it print? ``python text = "a b a b a b c" table = {} codes = [] for w in text.split(): if w not in table: table[w] = len(table) codes.append(table[w]) print(codes) ``

   [0, 0, 0, 0, 0, 0, 1][1, 2, 1, 2, 1, 2, 3][0, 1, 2, 0, 1, 2, 0][0, 1, 0, 1, 0, 1, 2]