question_answer

The owner of a plant nursery wanted to test the effectiveness of a new type of fertilizer. He measured the heights of 5 plants, and then gave each an equal amount of fertilizer. Two weeks later, he measured the heights of the plants again. The graph below shows the height of the plants before and after the addition of fertilizer.

KEY

€ Height before addition of fertilizer € Height after addition of fertilizer

                      What was the mean growth of the plants?

A)  4.5 cm                        

B)  5 cm               

C)  5.5 cm            

D)         6 cm

Correct Answer: A

Solution :

Mean growth of plants