Averaged length, net charge, and amino acid composition of 5069 peptides in the APD database:

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The average length of all 5069 is 30.01 residues.
The average net charge of all 5069 is 3.86

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I percent is 6.13%
V percent is 5.59%
L percent is 8.67%
F percent is 4.28%
C percent is 6.09%
M percent is 1.18%
A percent is 7.52%
W percent is 2.14%

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G percent is 10.79%
P percent is 4.39%

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T percent is 4.06%
S percent is 5.45%
Y percent is 2.47%
Q percent is 2.59%
N percent is 3.5%

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E percent is 2.6%
D percent is 2.46%
H percent is 2.03%
K percent is 10.75%
R percent is 7.16%

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If you want statistical information for a group of peptides, you can search the database first. Then select 'show statistic data' at the bottom of the 'query result' page.