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E:20061
4.25 A standard multiple-tube fermentation test was
conducted on a sample of water. The results of
the analysis for the confirmed test are given below.
Sample No. of positive No. of negative
results out of
5 tubes
4
1
2
Size
(mL)
10
results out of
5 tubes
1
3
1
0.1
4
0
0.01
5
MPN Index for combinations of positive
results when 5 tubes used per dilutions
(10 mL, 1.0 mL, 0.1 mL)
Combination MPN Index
of positives per 100 mL
5-4-3
280
4-3-1
33
4-2-1
26
2-1-0
7
Using the above MPN Index table, what is the
most probable number (MPN) of the sample?
(a) 280
(b) 33
(C) 26
(d) 70
[ESE: 2006


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