IMO- Mathematics Olympiad Class 9: Questions 626 - 630 of 919

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Question number: 626

» Statistics and Probability

MCQ▾

Question

The probability of guessing the correct answer to a certain test question is x2 . If the probability of not guessing the correct answer to this question is 23 , then x = ________

Choices

Choice (4) Response

a.

23

b.

2

c.

3

d.

13

Question number: 627

» Everyday Mathematics

MCQ▾

Question

Ten people are planning to share equally the cost of a rental bike. If one person withdraws from the arrangement and the others share equally the entire rental of the bike, then the share of each of the remaining persons is increased by ________ of the original share.

Choices

Choice (4) Response

a.

19

b.

109

c.

57

d.

7

Question number: 628

» Statistics and Probability

MCQ▾

Question

The average of 12 students is 15. The marks of a student who scored zero were wrongly taken as 18 and average was determined. The correct average marks is________

Choices

Choice (4) Response

a.

15

b.

12

c.

14.5

d.

13.5

Question number: 629

» Polynomials

MCQ▾

Question

3x3+y3=

Choices

Choice (4) Response

a.

(3x+y)(3x23xyy2)

b.

(3x+y)(3x23xy+y2)

c.

(3x+y)(3x2+3xy+y2)

d.

(3x+y)(3x2+3xy+y2)

Question number: 630

» Statistics and Probability

MCQ▾

Question

The average weight of the students of a class is 30 kg. 3 new students with the average weight of 36 kg. Having joined the class, the average weight of the class is increased by 3 kg. Find the number of students in the class originally?

Choices

Choice (4) Response

a.

3

b.

4

c.

5

d.

6

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