You will need to use Excel or comparable spreadsheet software to answer all problems.

Use the following forest stand age and yield (ft3/acre) data to answer questions 1 through 10.

Stand	ft3/acre
Age	Volume
10	3
11	5
12	9
13	15
14	23
15	33
16	45
17	59
18	75
19	93
20	113
21	135
22	159
23	185
24	213
25	243
26	275
27	309
28	345
29	383
30	423
31	465
32	509
33	555
34	603
35	653
36	705
37	759
38	815
39	873
40	933
41	995
42	1,059
43	1,125
44	1,193
45	1,263
46	1,335
47	1,409
48	1,485
49	1,559
50	1,631
51	1,701
52	1,769
53	1,835
54	1,899
55	1,961
56	2,021
57	2,079
58	2,135
59	2,189
60	2,241
61	2,291
62	2,339
63	2,385
64	2,429
65	2,471
66	2,511
67	2,548
68	2,585
69	2,619
70	2,651
71	2,681
72	2,709
73	2,735
74	2,759
75	2,781
76	2,801
77	2,819
78	2,835
79	2,849
80	2,861
81	2,871
82	2,879
83	2,885
84	2,889
85	2,891
86	2,891
87	2,889
88	2,885
89	2,879
90	2,871
91	2,861
92	2,849
93	2,835
94	2,819
95	2,801
96	2,781
97	2,759
98	2,735
99	2,709
100	2,681

Question 1

Identify the age at which the stands mean annual increment (MAI) is maximum.

Group of answer choices

a. 100

b. 67

c. 65

d. 76

e. 66

f. 61

g. 39

h. 57