Frequency distribution of letters in English text
Source: H. Beker and F. Piper,
Cipher Systems
, Wiley-Interscience, 1982.
A
8.167
B
1.492
C
2.782
D
4.253
E
12.702
F
2.228
G
2.015
H
6.094
I
6.996
J
0.153
K
0.772
L
4.025
M
2.406
N
6.749
O
7.507
P
1.929
Q
0.095
R
5.987
S
6.327
T
9.056
U
2.758
V
0.978
W
2.360
X
0.150
Y
1.974
Z
0.074