Students completing internships can book meetings of different lengths (either 30 minutes, 60 minutes, or 90 minutes) with their supervisor. 75% of the students book 30-minute meeting, 20% book 60-minute meetings, and 5% book 90-minute meetings.

What is the expected length of time (in minutes) for one meeting? Answer to two decimal places as needed.

Expected length of one meeting = minutes

What is the standard deviation (in minutes) for the distribution of meeting times? Answer to two decimal places as needed.

SD for the distribution of meeting times = mins