at least one estimation (point and interval) for population average

(+graph) and for population standard deviation

Number of Customers	Age
1	18
2	19
3	20
4	21
5	22
6	23
7	24
8	25
9	26
10	27
11	28
12	29
13	18
14	19
15	20
16	21
17	22
18	23
19	24
20	25
21	26
22	27
23	28
24	29
25	18
26	19
27	20
28	21
29	22
30	23
31	24
32	25
33	26
34	27
35	39
36	40
37	41
38	42
39	43
40	44
41	45
42	46
43	47
44	48
45	49
46	39
47	40
48	41
49	42
50	43
51	44
52	45
53	46
54	47
55	48
56	49
57	39
58	40
59	41
60	42
61	43
62	44
63	45
64	46
65	50
66	51
67	52
68	53
69	54
70	55
71	56
72	57
73	58
74	59
75	60
76	61
77	62
78	63
79	64
80	50
81	51
82	52
83	53
84	54
85	55
86	65
87	66
88	67
89	68
90	69
91	70
92	71
93	72
94	73
95	74
96	75
97	76
98	77
99	78
100	79