# Statistics & Probability [IMO Level 1- Mathematics Olympiad (SOF) Class 10]: Questions 1 - 5 of 83

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## Question 1

### Question

MCQ▾The mean of 12 observations is . By error, one observation was noted as was misread as 21. Then the correct mean is ________

### Choices

Choice (4) | Response | |
---|---|---|

a. | 29.25 | |

b. | 28.25 | |

c. | 23.25 | |

d. | 27.25 |

## Question 2

### Question

MCQ▾A bag contains 10 balls of two different colours, out of which x are cyan. One ball is drawn at random. If 20 more cyan balls are put in the bag, the probability of drawing a cyan ball now will be double that of the previous probability of drawing a cyan ball. Then, the value of x is ________

### Choices

Choice (4) | Response | |
---|---|---|

a. | 5 | |

b. | 9 | |

c. | 8 | |

d. | 4 |

## Question 3

### Question

MCQ▾One card is drawn from a well-shuffled deck of 52 cards the probability of neither a diamond nor a red queen is ________

### Choices

Choice (4) | Response | |
---|---|---|

a. | ||

b. | ||

c. | ||

d. |

## Question 4

### Question

MCQ▾For a frequency distribution, mean, median and mode are connected by which of the following relations?

### Choices

Choice (4) | Response | |
---|---|---|

a. | ||

b. | ||

c. | ||

d. |

## Question 5

### Question

MCQ▾A Jar contains 20 marbles of two different colours, out of which x are Blue. One Marble is drawn at random. If 10 more blue marbles are put in the jar, the probability of drawing a blue marbles now will be double that of the previous probability of drawing a blue marbles. Then, the value of x is ________

### Choices

Choice (4) | Response | |
---|---|---|

a. | 9 | |

b. | 8 | |

c. | 2 | |

d. | 5 |