Frequency distribution of letters in English text

Source: H. Beker and F. Piper, Cipher Systems, Wiley-Interscience, 1982.

A8.167
B1.492
C2.782
D4.253
E12.702
F2.228
G2.015
H6.094
I6.996
J0.153
K0.772
L4.025
M2.406
N6.749
O7.507
P1.929
Q0.095
R5.987
S6.327
T9.056
U2.758
V0.978
W2.360
X0.150
Y1.974
Z0.074