Consider the data summary above. After five weeks, the plants growing in soil containing worms grew an average of ___cm taller than plants growing without worms in the soil.

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

sadly i believe the answer is d