what is the lowest completion percentage by a qb with at least 300 attempts in a season

Cotton Davidson has the worst completion percentage by a quarterback with 300+ passing attempts in a season, at 37.1 percent in 1962.

Interpreted as:
What is the lowest completion percentage by a qb with at least 300 passing attempts in a season?
NAME PCT ATT SEASON TM GP CMP YDS AVG YDS/G TD INT RTG TD% INT% SCK SCKY
1 Cotton Davidson
C. Davidson
37.1
321
1962
TOT
14
119
1,977
6.2
141.2
7
23
36.1
2.2
7.2
2 Steve Tensi
S. Tensi
40.3
325
1967
DEN DEN
14
131
1,915
5.9
136.8
16
17
54.8
4.9
5.2
3 Babe Parilli
B. Parilli
40.6
426
1965
BOS BOS
14
173
2,597
6.1
185.5
18
26
50.0
4.2
6.1
4 Rusty Hilger
R. Hilger
41.2
306
1988
DET DET
11
126
1,558
5.1
141.6
7
12
48.9
2.3
3.9
31
251
5 Doug Williams
D. Williams
41.8
397
1979
TB TB
16
166
2,448
6.2
153.0
18
24
52.5
4.5
6.0
7
57
6 George Blanda
G. Blanda
42.1
442
1965
HOU HOU
14
186
2,542
5.8
181.6
20
30
47.9
4.5
6.8
7 Jack Kemp
J. Kemp
42.7
389
1966
BUF BUF
14
166
2,451
6.3
175.1
11
16
56.2
2.8
4.1
8 Jack Kemp
J. Kemp
43.6
369
1967
BUF BUF
14
161
2,503
6.8
178.8
14
26
50.0
3.8
7.0
9 Jim Hart
J. Hart
44.3
316
1968
STL STL
13
140
2,059
6.5
158.4
15
18
58.2
4.7
5.7
10 Vince Evans
V. Evans
44.7
436
1981
CHI CHI
16
195
2,354
5.4
147.1
11
20
51.1
2.5
4.6
23
173
11 Al Dorow
A. Dorow
45.0
438
1961
NYT NYT
14
197
2,651
6.1
189.4
19
30
50.7
4.3
6.8
12 Bobby Layne
B. Layne
45.2
336
1950
DET DET
12
152
2,323
6.9
193.6
16
18
62.1
4.8
5.4
13 Jack Kemp
J. Kemp
45.3
364
1961
SD SD
14
165
2,686
7.4
191.9
15
22
59.2
4.1
6.0
14 Steve DeBerg
S. DeBerg
45.4
302
1978
SF SF
12
137
1,570
5.2
130.8
8
22
40.0
2.6
7.3
17
156
15 Babe Parilli
B. Parilli
45.4
337
1963
BOS BOS
14
153
2,345
7.0
167.5
13
24
52.1
3.9
7.1
16 Dick Wood
D. Wood
45.5
352
1963
NYJ NYJ
12
160
2,204
6.3
183.7
18
19
60.6
5.1
5.4
17 Cotton Davidson
C. Davidson
45.8
330
1961
DLT DLT
14
151
2,445
7.4
174.6
17
23
59.2
5.2
7.0
18 Jack Kemp
J. Kemp
45.8
391
1965
BUF BUF
14
179
2,368
6.1
169.1
10
18
54.8
2.6
4.6
19 Bobby Layne
B. Layne
45.8
332
1951
DET DET
12
152
2,403
7.2
200.3
26
23
67.6
7.8
6.9
20 Jim Hart
J. Hart
45.8
373
1970
STL STL
14
171
2,575
6.9
183.9
14
18
61.5
3.8
4.8
26
216
21 Paul Christman
P. Christman
45.8
301
1947
CHC CHC
12
138
2,191
7.3
182.6
17
22
59.0
5.6
7.3
22 Norm Snead
N. Snead
45.9
375
1961
WAS WAS
14
172
2,337
6.2
166.9
11
22
51.6
2.9
5.9
23 Tobin Rote
T. Rote
45.9
342
1955
GB GB
12
157
1,977
5.8
164.8
17
19
57.8
5.0
5.6
24 Don Meredith
D. Meredith
46.2
305
1965
DAL DAL
14
141
2,415
7.9
172.5
22
13
79.9
7.2
4.3
25 Ed Brown
E. Brown
46.4
362
1963
PIT PIT
14
168
2,982
8.2
213.0
21
20
71.4
5.8
5.5
StatMuse has season-level data for completion percentage and passing attempts going back to the 1932 season.

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Eagles Eagles
11
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Lions Lions
12
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7
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12
1
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5
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