# Statistics & Probability (IMO- Mathematics Olympiad Class 10): Questions 36 - 41 of 80

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## Question number: 36

» Statistics & Probability

MCQ▾

### Question

The mean of 20 observations is. if each observation is multiplied by 2, then what is the new mean?

### Choices

Choice (4) Response

a.

60

b.

30

c.

70

d.

50

## Question number: 37

» Statistics & Probability

MCQ▾

### Question

A box contains 40 balls of two different colours, out of which x are black. One ball is drawn at random. If 20 more black balls are put in the box, the probability of drawing a black ball now will be double that of the previous probability of drawing a black ball. Then, the value of x is ________

### Choices

Choice (4) Response

a.

15

b.

14

c.

12

d.

10

## Question number: 38

» Statistics & Probability

MCQ▾

### Question

A Motor maintains an average speed of 70 km/hr while going from P to Q and maintains an average speed of 85 km/hr while coming back from Q to P. the average speed of the motor is ________.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 39

» Statistics & Probability

MCQ▾

### Question

Two dice are thrown simultaneously. The probability of getting a total 5, 6 or 7 is ________

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 40

» Statistics & Probability

MCQ▾

### Question

The mean of five numbers is 18. If one number is excluded, then their mean is 16, the excluded number is ________

### Choices

Choice (4) Response

a.

25

b.

26

c.

28

d.

24

## Question number: 41

» Statistics & Probability

MCQ▾

### Question

The average age of 5 teachers is 28 years. If one teacher is excluded the mean gets reduced by 2 years. The age of the excluded teacher is ________

### Choices

Choice (4) Response

a.

33 years

b.

36 years

c.

35 years

d.

26 years

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