Statistics and Probability (IMO- Mathematics Olympiad Class 9): Questions 70 - 70 of 101

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Question number: 70

» Statistics and Probability

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Question

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 shows the height of the plants before and after the addition of fertilizer.

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Created with Highcharts 4.2. 5PlantsHeight (cm) PLANT HEIGHTS BEFORE AND AFTER THE ADDITION OFFERTILIZERPLANT HEIGHTS BEFORE AND AFTER THE ADDITION OF FERTILIZER12.515.513.51817.51719.517.522.523Heights Before addition of fertilizerHeights two week after addition of fertilizerPlant 1Plant 2Plant 3Plant 4Plant 50102030Plant 5Heights two week after addition of fertilizer: 23

What was mean growth of the plants, to the nearest tenth of a centimeter?

Choices

Choice (4) Response

a.

4.5 cm

b.

6 cm

c.

5.5 cm

d.

5 cm

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