# Statistics & Probability (IMO- Mathematics Olympiad (SOF) Class 10): Questions 77 - 80 of 80

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## Question number: 77

» Statistics & Probability

MCQ▾

### Question

The mean of eight numbers is 30. If one number is excluded, then their mean is 34, the excluded number is ________

### Choices

Choice (4) Response

a.

5

b.

2

c.

8

d.

6

## Question number: 78

» Statistics & Probability

MCQ▾

### Question

The mean of 10 observations is. By error, one observation was noted as was misread as 24. Then the correct mean is ________

### Choices

Choice (4) Response

a.

21

b.

27

c.

25

d.

23

## Question number: 79

» Statistics & Probability

MCQ▾

### Question

A drawer contains 8 red socks, 12 white socks and 10 blue socks. Without looking you draw out a sock and then draw out a second sock without returning the first sock. What is the probability that the first sock and second sock are both white?

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 80

» Statistics & Probability

MCQ▾

### Question

Kruti took a loan at simple interest at in the first year with increases of in each subsequent year. She paid as interest after 4 years. How much loan did she take?

### Choices

Choice (4) Response

a.

Rs. 15800

b.

Rs. 30000

c.

Rs. 12500

d.

Rs. 33250

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