An organisation that supplies audiobooks over the internet is moving into a new office building - Edexcel - GCSE Computer Science - Question 3 - 2018 - Paper 1

1. May not have space for cables to be installed.
2. Employees and visitors can move around the building without disconnecting.
3. Adding new users just means giving out the SSID and password.

Data loss is acceptable in lossy compression because the removed data often pertains to information that is less critical for human perception. For instance, in audiobooks or music, some audio frequencies may not be noticeable to the average listener, and their removal can lead to significant reductions in file size without dramatically affecting the overall quality.

RLE may not be a good choice for encoding a text file because text files often contain diverse and unpredictable character arrangements. If characters are not repeated frequently, RLE will not compress the data efficiently and may even result in a larger file size compared to the original.

To find the total transmission time, we first calculate the total number of bits to transfer, which is:

1. Size of the audiobook file in bits: $81 \text{ MB} = 81 \times 1024^2 \text{ bytes} \times 8 \text{ bits/byte}$

2. Network speed in bits per second: $54 \text{ Mbps} = 54 \times 10^6 \text{ bits per second}$

3. Expression for time in seconds: $\text{Time (seconds)} = \frac{81 \times 1024^2 \times 8}{54 \times 10^6}$