30 customers on a scale of 1 to 5. The survey data is shown below. Calculate the mean and standard deviation of the survey and plot a histogram of the data. Does the distribution approximate Normal?

Customer	Satisfaction rating
1	4
2	3
3	2
4	5
5	5
6	2
7	1
8	4
9	3
10	4
11	4
12	5
13	3
14	3
15	2
16	1
17	5
18	3
19	4
20	3
21	4
22	2
23	4
24	4
25	3
26	3
27	3
28	2
29	2
30	3

Must importantly plotting a histogram of the data, 

Clear visibility of the plotted histogram of the data.