Statistics & Probability (IMO- Mathematics Olympiad Class 10): Questions 1 - 5 of 80

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Question number: 1

» Statistics & Probability

MCQ▾

Question

The mean of 12 observations is 30 . By error, one observation was noted as 12 was misread as 21. Then the correct mean is ________

Choices

Choice (4) Response

a.

23.25

b.

28.25

c.

27.25

d.

29.25

Question number: 2

» Statistics & Probability

MCQ▾

Question

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.

4

b.

5

c.

8

d.

9

Question number: 3

» Statistics & Probability

MCQ▾

Question

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.

1315

b.

1513

c.

1926

d.

139

Question number: 4

» Statistics & Probability

MCQ▾

Question

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

Choices

Choice (4) Response

a.

Mode=2Median3Mean

b.

Mode=3Median+2Mean

c.

Mode=3Median2Mean

d.

Mode=3Mean2Median

Question number: 5

» Statistics & Probability

MCQ▾

Question

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.

5

b.

8

c.

2

d.

9

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