1. The following information is available on the amount of time (in minutes) 100 customers were put on hold before their calls to a company's Customer Service 800-number were answered: Note: this is grouped (histogram) data.

Class #	Class (minutes)	# of Customers
1	0 and under 2	52
2	2 and under 4	20
3	4 and under 6	15
4	6 and under 8	9
5	8 and under 10	4
Total		100

1. What is the approximate average amount of time customers were put on hold? (2 marks)
2. What is the approximate standard deviation of the time customers were put on hold? (2 marks)
3. What percentage of customers were put on hold for greater than 8 minutes?

(2 marks)

d) What percentage of customers were put on hold for 6 minutes or less?

(2 marks)