How to add the symmetry axis of the normal distribution when graphing the histograms by groups

Code:

1. * Example generated by -dataex-. To install: ssc install dataex
2. clear
3. input double(tenaciousGoalPursuit group)
4. 2.9 2
5. 2.1 2
6. 3.5 2
7. 2.1 1
8. 3.9 2
9. 4 2
10. 3.4 2
11. 2.4 1
12. 3.3 2
13. 3.2 2
14. 3.3 1
15. 3.2 1
16. 2.2 1
17. 3.7 1
18. 4 2
19. 2.8 1
20. 2.9 2
21. 2.8 1
22. 3.2 2
23. 3.9 1
24. 2.8 1
25. 2.7 1
26. 3.5 2
27. 2.9 2
28. 3.5 2
29. 2.5 1
30. 2.6 1
31. 3.5 1
32. 3.4 1
33. 2.8 1
34. 3.2 2
35. 3.4 1
36. 3.3 2
37. 2.7 1
38. 2.9 2
39. 3.1 2
40. 3.3 1
41. 2.5 1
42. 4.5 1
43. 3.2 1
44. 4.5 2
45. 3.5 1
46. 2 1
47. 2.1 1
48. 3.4 2
49. 2.6 2
50. 2.6 2
51. 3.3 2
52. 2.8 1
53. 3.5 2
54. 3.6 1
55. 3.3 2
56. 3 2
57. 3.5 2
58. 2.5 1
59. 4.1 2
60. 2.8 2
61. 3.1 2
62. 2.5 1
63. 3.1 1
64. 2.9 2
65. 3.1 2
66. 3.4 1
67. 2.6 1
68. 1.7 1
69. 3.8 2
70. 3.3 1
71. 2.3 1
72. 3.5 1
73. 2.3 1
74. 2.6 1
75. 2.2 1
76. 2.7 1
77. 3.7 1
78. 2.3 1
79. 3.2 2
80. 3.6 2
81. 3.8 1
82. 3.8 1
83. 2.7 1
84. 3.2 1
85. 3.5 2
86. 3.3 1
87. 4 1
88. 2.9 2
89. 3.4 2
90. 2.4 1
91. 2.5 2
92. 2.8 1
93. 3 1
94. 3.6 2
95. 2.2 1
96. 3.1 1
97. 2.4 1
98. 2.9 2
99. 3.3 1
100. 3.2 2
101. 3.4 1
102. 3.3 1
103. 3 1
104. end
105. hist tenaciousGoalPursuit ,by(group) normal

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