Free Quote Provider Data Wrong?

From time to time I look at them :
http://finance.yahoo.com/q/hp?s=^DJI
it almost guest the low : 10,259.35 on 14th April whereas it was made 10250 ... on 21th April :D
Really I wonder what they use to generate such non-sense: not one single quote is exact ! Do you realise that they really need an algorithm to do that :p

Date Open High Low Close Volume Adj Close*
23-Apr-04 10,463.11 10,543.95 10,362.97 10,472.84 13,961,000 10,472.84
22-Apr-04 10,314.99 10,529.12 10,255.88 10,461.20 18,267,000 10,461.20
21-Apr-04 10,311.87 10,398.53 10,200.38 10,317.27 17,381,000 10,317.27
20-Apr-04 10,437.85 10,530.61 10,297.39 10,314.50 15,085,000 10,314.50
19-Apr-04 10,451.62 10,501.79 10,351.97 10,437.85 11,949,000 10,437.85
16-Apr-04 10,398.32 10,500.57 10,343.74 10,451.97 14,878,000 10,451.97
15-Apr-04 10,377.95 10,481.21 10,279.37 10,397.46 15,687,000 10,397.46
14-Apr-04 10,378.10 10,453.39 [10,259.35] 10,377.95 15,477,000 10,377.95
13-Apr-04 10,516.05 10,572.13 10,343.17 10,381.28 14,232,000 10,381.28
12-Apr-04 10,444.38 10,559.28 10,439.27 10,515.56 11,024,000 10,515.56
8-Apr-04 10,482.77 10,590.15 10,383.84 10,442.03 11,998,000 10,442.03
7-Apr-04 10,569.26 10,580.51 10,422.74 10,480.15 14,588,000 10,480.15

Quote from harrytrader:

What calculations ? :D Explain me how they can "calculate" the highs given by yahoo since 5 days at

10666.88 10676.96 10665.7 10717.4 10691.77

which are all false since the new high of the year is at 10661,
remarks that they give decimals so strange indeed :D.


16/01/04 00:00 10556.37 10666.88 10503.7 10600.51 17211000 10600.51
20/01/04 00:00 10601.4 10676.96 10447.92 10528.66 16982000 10528.66
21/01/04 00:00 10522.77 10665.7 10453.11 10623.62 17576000 10623.62
22/01/04 00:00 10624.22 10717.4 10545.03 10623.18 16937000 10623.18
23/01/04 00:00 10625.25 10691.77 10490.14 10568.29 15612000 10568.29
 
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