a) The time students entered the classroom of OM 390, Introductory Operations Management, was recorded by the professor in the table below for five class meetings. apply and analyze a histogram of these data. Please note that a negative time means that the student arrived after the start of class.

Minutes Arrival Before Class (class starts at time 0)	Class 1	Class 2	Class 3	Class 4	Class 5
15	3	4	6	1	4
14	0	0	2	1	3
13	1	2	0	3	1
12	1	0	0	1	0
11	1	1	2	1	0
10	2	0	0	1	1
9	4	2	0	2	0
8	0	1	4	3	0
7	1	5	1	0	3
6	1	1	2	1	2
5	5	6	2	4	5
4	6	1	7	4	6
3	0	0	3	2	0
2	3	2	0	5	0
1	2	2	0	0	4
0	1	2	0	0	1
1	0	0	0	0	1
2	0	0	0	0	0
3	0	0	0	1	0
4	0	0	0	0	0
5	0	1	0	0	0
6	0	0	0	0	0
7	0	0	0	0	0
8	0	0	1	0	0
9	0	0	0	1	0
10	0	0	0	0	0

b)Using the data from the preceding problem, the instructor in charge of these five classes strongly feels that the arrival patterns are strongly influenced by the class (i.e., the arrival rates vary by class). Do the data support this position? (Hint: Look at the histograms for each class separately.)

c) Using the data from problem 1, you have been asked to develop an overall cause-and-effect chart explaining why students arrived so early.