Four students, 1, 2, 3 and 4, counted the number of bubbles of oxygen given off in a minute when investigating the effect of catalase from plant tissue on hydrogen peroxide.
Each student repeated the experiment five times and calculated the mean number of bubbles per
minute.
Which have correctly calculated the mean?
1 )
1 and 4 only
2 and 3 only
3 )
1, 2, 3 and 4
4 )
3 only
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