# Statistics & Probability (IMO- Mathematics Olympiad (SOF) Class 10): Questions 26 - 31 of 80

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## Question number: 26

» Statistics & Probability

MCQ▾

### Question

The mean of 7 observations is 20. If the mean of the first 4 observations is 20 and that of the last 4 observations is 16, then the Fourth observation is ________

### Choices

Choice (4) Response

a.

3

b.

7

c.

8

d.

4

## Question number: 27

» Statistics & Probability

MCQ▾

### Question

The mean of is ________

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 28

» Statistics & Probability

MCQ▾

### Question

If occur with frequencies respectively, then the arithmetic mean is ________

### Choices

Choice (4) Response

a.

4.4

b.

5.5

c.

3.5

d.

6.5

## Question number: 29

» Statistics & Probability

MCQ▾

### Question

A bag contains 6 Red, 9 Blue and 5 Black marbles. If a marble is drawn at random from the bag, the probability that the marble drawn is red or Blue, is ________

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 30

» Statistics & Probability

MCQ▾

### Question

One card is drawn from a well-shuffled deck of 52 cards the probability of drawing an ace is ________

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 31

» Statistics & Probability

MCQ▾

### Question

A bag contains 15 balls of two different colours, out of which x are Pink. One ball is drawn at random. If 5 more Pink balls are put in the bag, the probability of drawing a Pink ball now will be double that of the previous probability of drawing a Pink ball. Then, the value of x is ________

### Choices

Choice (4) Response

a.

6

b.

3

c.

5

d.

4

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