Two pairs of students each 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 pair repeated the experiment five times and calculated the mean number of bubbles per minute.
Which have correctly calculated the mean?
1 )
1, 3 and 4 only
2 )
1 and 4 only
2 only
4 )
3 only
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