Operations research

See attached image for details. The use of statistical software such as maple is encouraged.

Answers can be viewed only if
1. The questioner was satisfied and accepted the answer, or
2. The answer was disputed, but the judge evaluated it as 100% correct.
• The average number of arrival is 20 students every 15 minutes.

• There is s typo in the second equation. The number 320 in both places should be replaced by 20.

• The final answer 11.218% is of course correct.

• Thanks for the answer you seem to understand this well. I have posted another question on an M/M/c queuing model, do you think you could answer that?