Statistics and Probability (IMO- Mathematics Olympiad Class 9): Questions 91 - 96 of 101

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Question number: 91

» Statistics and Probability

MCQ▾

Question

A number x is chosen at random from the numbers -3, -2, -1, 0, 1, 2, 3. The probability that x <2 is ________

Choices

Choice (4) Response

a.

37

b.

27

c.

17

d.

57

Question number: 92

» Statistics and Probability

MCQ▾

Question

A box contains 12 balls out of which x are black. If one ball is drawn at random from the box, what is the probability that it will be a black ball? If 6 more black balls are put in the box, the probability of drawing a black ball is now double of what is was before, then x is________

Choices

Choice (4) Response

a.

3

b.

7

c.

5

d.

2

Passage

A Bus is going on a long journey for 25 hours, starting at 6.00 hrs. The speed of the car at different hours is given below:

Bus with its speed values is given

Calculate the values as asked in question

Time (in hrs):

6

8

9

13

14

18

20

22

25

Speed (in km/hour):

30

60

50

40

60

70

80

60

20

From the above table answer the following questions.

Question number: 93 (1 of 3 Based on Passage) Show Passage

» Statistics and Probability

MCQ▾

Question

The percentage of increase in speed during 14.00 hrs and 18.00 hrs is ________

Choices

Choice (4) Response

a.

16%

b.

40%

c.

30%

d.

50%

Question number: 94 (2 of 3 Based on Passage) Show Passage

» Statistics and Probability

MCQ▾

Question

The percentage of decrease in speed during 22.00 hrs and 25.00 hrs is ________

Choices

Choice (4) Response

a.

30.67%

b.

66.67%

c.

50.80%

d.

80.54%

Question number: 95 (3 of 3 Based on Passage) Show Passage

» Statistics and Probability

MCQ▾

Question

The average speed (in km/hour) between 6.00 hrs, 8.00 hrs, 9.00 hrs and 13.00 hrs is ________

Choices

Choice (4) Response

a.

45

b.

67

c.

48

d.

96

Question number: 96

» Statistics and Probability

MCQ▾

Question

In a class test, in Science, 45 students scored 88 marks, 15 students scored 75 marks and 5 scored 60 marks. The mean of their score is (approximately) ________

Choices

Choice (4) Response

a.

75 marks

b.

83 marks

c.

80 marks

d.

90 marks

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