Answer:
6 cm
Explanation:
The difference in average height of the plants, that growing in worm and that which without worm is given in the table,
The difference in average height after 5 weeks Can be directly culled from the table, the value is 6;
This value can be calculated thus :
Experimental group average -, Control group average at 5 weeks
55 - 49 = 6 cm
