IMO- Mathematics Olympiad (SOF) Class 10: Questions 405 - 410 of 958

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Question number: 405

» Statistics & Probability

MCQ▾

Question

The mean of 20 observations is. if each observation is multiplied by 2, then what is the new mean?

Choices

Choice (4) Response

a.

60

b.

30

c.

70

d.

50

Question number: 406

» Statistics & Probability

MCQ▾

Question

A box contains 40 balls of two different colours, out of which x are black. One ball is drawn at random. If 20 more black balls are put in the box, the probability of drawing a black ball now will be double that of the previous probability of drawing a black ball. Then, the value of x is ________

Choices

Choice (4) Response

a.

15

b.

14

c.

12

d.

10

Question number: 407

» Statistics & Probability

MCQ▾

Question

A Motor maintains an average speed of 70 km/hr while going from P to Q and maintains an average speed of 85 km/hr while coming back from Q to P. the average speed of the motor is ________.

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 408

» Coordinate Geometry

MCQ▾

Question

is three vertices of the parallelogram PQRS. The coordinates of fourth vertex is ________

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 409

» Coordinate Geometry

MCQ▾

Question

Four vertices of a parallelogram taken in order are. What will be the ratio of a and b?

Choices

Choice (4) Response

a.

b.

2: 9

c.

3: 7

d.

1: 9

Question number: 410

» Coordinate Geometry

MCQ▾

Question

PQR is an isosceles triangle. If the coordinates of the base are , then the coordinates of the vertex P can be

Choices

Choice (4) Response

a.

b.

c.

d.

None of the above

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