# Statistics & Probability (IMO- Mathematics Olympiad Class 10): Questions 71 - 76 of 80

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## Question number: 71

» Statistics & Probability

MCQ▾

### Question

The average of 15 results is 50. If the average of the first six results is 82 and that of the last six is 62, then the sixth result is ________

### Choices

Choice (4) Response

a.

57

b.

58

c.

59

d.

60

## Question number: 72

» Statistics & Probability

MCQ▾

### Question

The king, queen and jack of clubs are removed from a deck of 52 playing cards and then well-shuffled. One card is selected from the remaining cards. The probability of getting a ‘8’ of black color is ________

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 73

» Statistics & Probability

MCQ▾

### Question

The mean of 10 observations is. if each observation is multiplied by 4, then what is the new mean?

### Choices

Choice (4) Response

a.

50

b.

70

c.

30

d.

60

## Question number: 74

» Statistics & Probability

MCQ▾

### Question

The mean of 9 observations is 36. If the mean of the first 5 observations is 32 and that of the last 5 observations is 39, then the fifth observation is ________

### Choices

Choice (4) Response

a.

37

b.

28

c.

31

d.

43

## Question number: 75

» Statistics & Probability

MCQ▾

### Question

A card is drawn from a packet of 200 cards numbered 1 to 200. The probability of drawing a number which is a thrice is ________

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 76

» Statistics & Probability

MCQ▾

### Question

The average of 11 results is 60. If the average of the first six results is 72 and that of the last six is 52, then the sixth result is ________

### Choices

Choice (4) Response

a.

87

b.

88

c.

84

d.

86

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