what is the average number of strikeouts for a batter in a season

Gus Alberts struck out 5 times in 1891.

	NAME	SO	SEASON	TM	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SB	PA	TB	XBH	AVG	OBP	SLG	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Gus Alberts G. Alberts	5	1891	MIL	12	41	6	4	0	0	0	2	7	2	1	50	4	0	.098	.260	.098	.358	3	-4.5	.219	26	-5.8
2	Bob Allen B. Allen	44	1891	PHN	118	438	46	97	7	4	1	51	43	0	12	481	115	12	.221	.291	.263	.554	50	-20.1	.279	69	-22.7
3	Billy Alvord B. Alvord	45	1891	TOT	94	371	35	90	10	5	1	37	11	1	3	383	113	16	.243	.266	.305	.571	38	-17.4	.275	64	-21.7
4	Ed Andrews E. Andrews	35	1891	CNA	83	356	47	75	7	4	0	26	33	1	22	390	90	11	.211	.279	.253	.532	37	-19.6	.269	57	-26.5
5	Cap Anson C. Anson	29	1891	CHI	136	540	81	157	24	8	8	120	75	1	17	616	221	40	.291	.378	.409	.788	115	24.8	.382	122	20.7
6	Jersey Bakley J. Bakley	18	1891	TOT	21	66	4	12	2	0	0	5	10	1	0	77	14	2	.182	.299	.212	.511	8	-3.6	.273	62	-4.6
7	Mark Baldwin M. Baldwin	67	1891	PIT	53	177	11	27	3	2	1	12	15	0	1	192	37	6	.153	.219	.209	.428	10	-17.7	.216	38	-17.8
8	Bob Barr B. Barr	3	1891	NYG	5	11	0	1	0	0	0	0	2	0	0	13	1	0	.091	.231	.091	.322	0	-1.4	.194	26	-1.4
9	Charley Bassett C. Bassett	29	1891	NYG	130	524	60	136	19	8	4	68	36	4	16	564	183	31	.260	.312	.349	.661	77	-5.1	.320	93	-5.5
10	Ollie Beard O. Beard	9	1891	LOU	68	257	35	62	4	5	0	24	33	1	7	291	76	9	.241	.330	.296	.626	39	-3.8	.315	89	-5.1
11	Ed Beatin E. Beatin	2	1891	CLE	5	13	0	1	0	0	0	0	0	0	0	13	1	0	.077	.077	.077	.154	-1	-2.7	.075	-43	-2.8
12	Jake Beckley J. Beckley	46	1891	PIT	133	554	94	162	20	19	4	73	44	8	13	606	232	43	.292	.353	.419	.772	106	18.1	.369	119	17.6
13	Ed Beecher E. Beecher	13	1891	TOT	74	306	44	72	13	7	2	35	30	5	24	341	105	22	.235	.314	.343	.657	47	-2.9	.321	87	-7
14	Charlie Bell C. Bell	8	1891	TOT	11	32	4	3	0	0	0	1	6	0	0	38	3	0	.094	.237	.094	.331	2	-4	.199	29	-4.2
15	Charlie Bennett C. Bennett	61	1891	BSN	75	256	35	55	9	3	5	39	42	3	3	301	85	17	.215	.332	.332	.664	44	-0.2	.331	93	-3
16	Tun Berger T. Berger	10	1891	PIT	43	134	15	32	2	1	1	14	12	3	4	149	39	4	.239	.315	.291	.606	19	-3.2	.305	85	-3.3
17	Lou Bierbauer L. Bierbauer	19	1891	PIT	121	500	60	103	13	6	1	47	28	3	12	531	131	20	.206	.252	.262	.514	44	-33.2	.253	58	-33.6
18	George Boone G. Boone	1	1891	LOU	4	6	0	2	0	0	0	0	0	0	0	6	2	0	.333	.333	.333	.667	1	0	.324	93	-0.1
19	Bill Bowman B. Bowman	9	1891	CHI	15	45	2	4	1	0	0	5	5	1	0	51	5	1	.089	.196	.111	.307	1	-6.4	.176	12	-6.7
20	Sumner Bowman S. Bowman	12	1891	PHA	14	54	8	13	4	0	0	2	2	0	1	56	17	4	.241	.268	.315	.583	6	-2.3	.280	66	-3
21	Jack Boyle J. Boyle	35	1891	STL	121	434	76	122	18	8	5	79	44	12	18	490	171	31	.281	.363	.394	.757	86	14.4	.368	106	4.9
22	Steve Brodie S. Brodie	39	1891	BSN	133	523	84	136	13	6	2	78	63	10	25	596	167	21	.260	.351	.319	.670	89	2.4	.336	96	-3.3
23	Dan Brouthers D. Brouthers	20	1891	BSA	130	486	117	170	26	19	5	109	87	24	31	597	249	50	.350	.471	.512	.983	154	66.5	.471	164	60.2
24	Tom Brown T. Brown	96	1891	BSA	137	589	177	189	30	21	5	72	70	4	106	663	276	56	.321	.397	.469	.865	139	42.6	.412	134	35.6
25	William Brown W. Brown	35	1891	PHN	115	441	62	107	20	4	0	50	34	4	7	479	135	24	.243	.303	.306	.609	58	-11.8	.301	80	-14.3