# Statistics and Probability (IMO- Mathematics Olympiad (SOF) Class 9): Questions 71 - 77 of 101

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## Question number: 71

» Statistics and Probability

MCQ▾

### Question

Cards marked with the numbers 2 to 101 are placed in a box and mixed thoroughly. One card is drawn from this bag. The probability that the number which is a perfect square is ________

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 72

» Statistics and Probability

MCQ▾

### Question

A card is drawn at random from a well shuffled pack of 52 cards. The probability that the cards drawn in neither a red card nor a queen are ________

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 73

» Statistics and Probability

MCQ▾

### Question

Two dice are thrown simultaneously. The odds against getting the sum 6 is________

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 74

» Statistics and Probability

MCQ▾

### Question

Two coins are tossed simultaneously. The probability of getting at two head is ________

### Choices

Choice (4) Response

a.

b.

c.

d.

0

## Question number: 75

» Statistics and Probability

MCQ▾

### Question

The average of 9 numbers is 8. What should be added as 10th number to make the average 9?

### Choices

Choice (4) Response

a.

10

b.

72

c.

90

d.

18

## Question number: 76

» Statistics and Probability

MCQ▾

### Question

In a class test, in mathematics, 10 students scored 75 marks, 12 students scored 60 marks, 8 scored 40 marks and 3 scored 30 marks. The mean of their score is (approximately) ________

### Choices

Choice (4) Response

a.

56 marks

b.

54 marks

c.

15 marks

d.

57 marks

## Question number: 77

» Statistics and Probability

MCQ▾

### Question

A box contains 8 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 4 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.

2

c.

9

d.

6

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