Statistics & Probability (IMO- Mathematics Olympiad Class 10): Questions 75 - 79 of 79

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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.

370

b.

250

c.

140

d.

130

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

Question number: 77

» Statistics & Probability

MCQ▾

Question

The mean of eight numbers is 30. If one number is excluded, then their mean is 34, the excluded number is ________

Choices

Choice (4) Response

a.

5

b.

2

c.

8

d.

6

Question number: 78

» Statistics & Probability

MCQ▾

Question

The mean of 10 observations is 28 . By error, one observation was noted as 14 was misread as 24. Then the correct mean is ________

Choices

Choice (4) Response

a.

21

b.

27

c.

25

d.

23

Question number: 79

» Statistics & Probability

MCQ▾

Question

A drawer contains 8 red socks, 12 white socks and 10 blue socks. Without looking you draw out a sock and then draw out a second sock without returning the first sock. What is the probability that the first sock and second sock are both white?

Choices

Choice (4) Response

a.

22145

b.

2230

c.

22160

d.

12130

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