Statistics and Probability (IMO- Mathematics Olympiad Class 9): Questions 48 - 54 of 101

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Passage

A car is going on a long journey for 16 hours, starting at 5.00 hrs. The speed of the car at different hours is given below:

car with its speed values is given

Calculate the values as asked in question

Time (in hrs):

5

7

9

11

13

17

15

19

21

Speed (in km/hour):

40

50

60

80

70

65

75

60

50

From the above table answer the following questions.

Question number: 48 (2 of 3 Based on Passage) Show Passage

» Statistics and Probability

MCQ▾

Question

The percentage of decrease in speed during 19.00 hrs and 21.00 hrs is ________

Choices

Choice (4) Response

a.

1723%

b.

1613%

c.

1823%

d.

1623%

Question number: 49 (3 of 3 Based on Passage) Show Passage

» Statistics and Probability

MCQ▾

Question

The percentage of increase in speed during 9.00 hrs and 11.00 hrs is ________

Choices

Choice (4) Response

a.

35%

b.

2313%

c.

45%

d.

3313%

Question number: 50

» Statistics and Probability

MCQ▾

Question

The median of the observation 30, 91, 0, 64, 42, 80, 30, 5, 117, 71 is ________

Choices

Choice (4) Response

a.

53

b.

51

c.

52

d.

52.5

Question number: 51

» Statistics and Probability

MCQ▾

Question

A die is thrown once. The probability of getting a number greater than 3 is ________

Choices

Choice (4) Response

a.

23

b.

12

c.

0

d.

13

Question number: 52

» Statistics and Probability

MCQ▾

Question

The average of n numbers x1,x2,x3,.,xn is A. if x1 is replaced by (x+a)x1,x2 is replaced by (x+a)x2 , …, then the new average is ________

Choices

Choice (4) Response

a.

(x1)+nxnn

b.

(x+a)A

c.

nA+(n+1)xnn

d.

(n+1)A+xnn

Question number: 53

» Statistics and Probability

MCQ▾

Question

The King, queen and jack of clubs are removed from a deck of 52 cards and then well-shuffled. One card id selected from the remaining cards. The probability of getting a black card is ________

Choices

Choice (4) Response

a.

13

b.

12

c.

23

d.

32

Question number: 54

» Statistics and Probability

MCQ▾

Question

Average weight of 9 persons is 48 kg. If one man weighing 32 kg, died, what is an average age of the remaining 8 persons.

Choices

Choice (4) Response

a.

50

b.

52

c.

54

d.

56

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