# IMO Level 1- Mathematics Olympiad (SOF) Class 10: Questions 380 - 387 of 968

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## Question 380

### Question

MCQ▾

If the centroid of the triangle formed by the points is at the origin, then

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Choice (4)Response

a.

b.

c.

d.

## Question 381

### Question

MCQ▾

The mean of ten numbers is 60. If one number is excluded, then their mean is 50, the excluded number is ________

### Choices

Choice (4)Response

a.

130

b.

140

c.

150

d.

160

## Question 382

### Question

MCQ▾

Find the area of the triangle whose vertices are and

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Choice (4)Response

a.

b.

c.

d.

## Question 383

### Question

MCQ▾

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

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Choice (4)Response

a.

b.

c.

d.

## Question 384

### Question

MCQ▾

The mean of 7 observations is 20. If the mean of the first 4 observations is 20 and that of the last 4 observations is 16, then the Fourth observation is ________

### Choices

Choice (4)Response

a.

7

b.

4

c.

8

d.

3

## Question 385

### Question

MCQ▾

In the given figure And , then ________

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Choice (4)Response

a.

b.

c.

d.

## Question 386

### Question

MCQ▾

The mean of is ________

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Choice (4)Response

a.

b.

c.

d.

## Question 387

### Question

MCQ▾

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

### Choices

Choice (4)Response

a.

b.

c.

d.