what is the highest avg% by a single mlb team in a single postseason, playing at least 7 games

The Pittsburgh Pirates played 8 games in 1903.

	TEAM	G	SEASON	W%	W	L	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	IBB	GIDP	AVG	OBP	SLG	OPS
1	Pirates	8	1903	.375	3	5	270	24	64	7	9	1	22	14	1	45	9	3	288	92	17	3	0	1	.237	.277	.341	.618
2	Americans	8	1903	.625	5	3	281	39	69	4	16	2	34	14	3	29	5	2	304	111	22	6	0	4	.246	.289	.395	.684
3	Pirates	7	1909	.571	4	3	223	34	50	13	1	2	25	20	6	34	18	6	258	71	16	9	0	0	.224	.305	.318	.624
4	Tigers	7	1909	.429	3	4	232	28	56	18	0	2	26	20	4	22	6	6	261	80	20	5	0	1	.241	.313	.345	.657
5	Giants	8	1912	.429	3	4	274	31	74	14	4	1	25	22	3	39	12	11	303	99	19	4	2	1	.270	.331	.361	.692
6	Red Sox	8	1912	.571	4	3	273	25	60	14	6	1	21	19	1	36	6	2	299	89	21	6	1	2	.220	.273	.326	.599
7	Reds	8	1919	.625	5	3	251	35	64	10	7	0	33	25	5	22	7	10	292	88	17	11	0	4	.255	.335	.351	.685
8	White Sox	8	1919	.375	3	5	263	20	59	10	3	1	17	15	3	30	5	5	287	78	14	6	0	2	.224	.274	.297	.571
9	Robins	7	1920	.286	2	5	215	8	44	5	1	0	8	10	0	20	1	4	230	51	6	5	1	5	.205	.240	.237	.477
10	Indians	7	1920	.714	5	2	217	21	53	9	2	2	18	21	0	21	2	6	240	72	13	2	3	3	.244	.311	.332	.643
11	Giants	8	1921	.625	5	3	264	29	71	13	4	2	28	22	1	38	7	9	292	98	19	5	0	4	.269	.328	.371	.699
12	Yankees	8	1921	.375	3	5	241	22	50	7	1	2	20	27	1	44	6	7	276	65	10	7	0	2	.207	.290	.270	.560
13	Giants	7	1924	.429	3	4	253	27	66	9	2	4	21	25	2	40	3	3	284	91	15	4	3	8	.261	.332	.360	.692
14	Senators	7	1924	.571	4	3	248	26	61	9	0	5	25	29	0	34	5	2	282	85	14	5	1	4	.246	.325	.343	.668
15	Pirates	7	1925	.571	4	3	230	25	61	12	2	4	25	17	4	32	7	1	257	89	18	6	1	6	.265	.327	.387	.714
16	Senators	7	1925	.429	3	4	225	26	59	8	0	8	26	17	2	32	2	5	252	91	16	8	0	1	.262	.320	.404	.724
17	Cardinals	7	1926	.571	4	3	239	31	65	12	1	4	30	11	1	30	2	4	260	91	17	9	0	3	.272	.307	.381	.688
18	Yankees	7	1926	.429	3	4	223	21	54	10	1	4	20	31	1	31	1	3	262	78	15	7	2	5	.242	.337	.350	.687
19	Cardinals	7	1931	.571	4	3	229	19	54	11	0	2	17	9	0	41	8	2	242	71	13	4	0	3	.236	.265	.310	.575
20	Athletics	7	1931	.429	3	4	227	22	50	5	0	3	20	28	1	46	0	0	260	64	8	4	1	5	.220	.309	.282	.591
21	Cardinals	7	1934	.571	4	3	262	34	73	14	5	2	32	11	1	31	2	4	278	103	21	4	0	4	.279	.310	.393	.703
22	Tigers	7	1934	.429	3	4	250	23	56	12	1	2	20	25	2	43	5	3	283	76	15	6	3	1	.224	.300	.304	.604
23	Reds	7	1940	.571	4	3	232	22	58	14	0	2	21	15	0	30	1	2	251	78	16	4	4	4	.250	.296	.336	.632
24	Tigers	7	1940	.429	3	4	228	28	56	9	3	4	24	30	0	30	0	3	261	83	16	3	2	7	.246	.333	.364	.697
25	Cubs	7	1945	.429	3	4	247	29	65	16	3	1	27	19	0	48	2	3	276	90	20	10	2	3	.263	.316	.364	.680