# Statistics and Probability (IMO- Mathematics Olympiad Class 9): Questions 69 - 70 of 101

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 919 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 450.00 or

## Question number: 69

» Statistics and Probability

MCQ▾

### Question

The probability of guessing the correct answer to a certain test question is. If the probability of not guessing the correct answer to this question is , then x = ________

### Choices

Choice (4) Response

a.

b.

c.

d.

5

## Question number: 70

» Statistics and Probability

MCQ▾

### 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.

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

f Page