# Statistics & Probability [IMO Level 1- Mathematics Olympiad (SOF) Class 10]: Questions 1 - 5 of 83

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## Question 1

Statistics & Probability

### Question

MCQ▾

The mean of 12 observations is . By error, one observation was noted as was misread as 21. Then the correct mean is ________

### Choices

Choice (4)Response

a.

29.25

b.

28.25

c.

23.25

d.

27.25

## Question 2

Statistics & Probability

### Question

MCQ▾

A bag contains 10 balls of two different colours, out of which x are cyan. One ball is drawn at random. If 20 more cyan balls are put in the bag, the probability of drawing a cyan ball now will be double that of the previous probability of drawing a cyan ball. Then, the value of x is ________

### Choices

Choice (4)Response

a.

5

b.

9

c.

8

d.

4

## Question 3

Statistics & Probability

### Question

MCQ▾

One card is drawn from a well-shuffled deck of 52 cards the probability of neither a diamond nor a red queen is ________

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 4

Statistics & Probability

### Question

MCQ▾

For a frequency distribution, mean, median and mode are connected by which of the following relations?

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 5

Statistics & Probability

### Question

MCQ▾

A Jar contains 20 marbles of two different colours, out of which x are Blue. One Marble is drawn at random. If 10 more blue marbles are put in the jar, the probability of drawing a blue marbles now will be double that of the previous probability of drawing a blue marbles. Then, the value of x is ________

### Choices

Choice (4)Response

a.

9

b.

8

c.

2

d.

5

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