# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 844 - 849 of 929

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## Question number: 844

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MCQ▾

### Question

The mean of 24 observations is 35. If the mean of the first 12 observations is 31 and that of the last 12 observations is 38, then the 12th observation is ________

### Choices

Choice (4) Response

a.

15

b.

11

c.

14

d.

12

## Question number: 845

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MCQ▾

### Question

Choose the correct alternative that will continue the same pattern. 6,11,21,36,56, (…. . )

### Choices

Choice (4) Response

a.

91

b.

42

c.

81

d.

51

## Question number: 846

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MCQ▾

### Question

Which equation satisfies the data in the table?

 X 3 5 7 9 Y 2 4 6 8

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 847

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MCQ▾

Factors of

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 848

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MCQ▾

### Question

In a mathematics test given to 15 students, the following marks (out of 100) is recorded: 45,56,78,54,75,34,68,98,87,99,90,76,55,77,68, then mean, median and mode of this data are respectively ________

### Choices

Choice (4) Response

a.

70.67,75,68

b.

55.26,78,65

c.

70.67,77,68

d.

60.67,75,65

## Question number: 849

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MCQ▾

### Question

A man purchased two clocks A and B at a total cost Rs. 650. He sells A at profit and B at a loss of and gets the same selling price for both the clocks. What are the purchasing prices of A and B respectively?

### Choices

Choice (4) Response

a.

Rs. 275, Rs. 375

b.

Rs. 300, Rs. 350

c.

Rs. 250, Rs. 400

d.

Rs. 225, Rs. 425