# Mathematics [NSTSE (National Science Talent Search Exam- Unified Council) Class 9]: Questions 684 - 690 of 989

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## Question 684

Mathematics
Edit

### Question

MCQ▾

The mean of five numbers is 32. If one of the numbers is excluded the mean gets reduced by 4. The excluded number is

### Choices

Choice (4)Response

a.

4

b.

6

c.

8

d.

7

## Question 685

Edit

### Question

MCQ▾

The cost of painting the TSA of cone at is Rs. 140.80. The volume of the cone its slant height being 48 cm is

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 686

Mathematics
Edit

### Question

MCQ▾

The daily sale of kerosene (in liters) in a ration shop for six days is as follows:

65,90,68,55,92.5 and 127.5 The average daily sale is

### Choices

Choice (4)Response

a.

83

b.

72

c.

89

d.

98

## Question 687

Mathematics
Edit

### Question

MCQ▾

Addition of rational numbers does not satisfy which of the following property?

### Choices

Choice (4)Response

a.

Commutative

b.

Associative

c.

Closure

d.

None of the above

## Question 688

Mathematics
Edit

### Question

MCQ▾

The mean of 9, x, 5, y and 13 is 8. Then

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 689

Mathematics
Edit

### Question

MCQ▾

The division of two factors with unlike signs is ________.

### Choices

Choice (4)Response

a.

Positive

b.

Cannot be determined

c.

Negative

d.

Question does not provide sufficient data or is vague

## Question 690

Mathematics
Edit

### Question

MCQ▾

The probability for a randomly selected number out of 21,22,23,24, …. , 50 to be a prime number is

### Choices

Choice (4)Response

a.

b.

c.

d.