# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 626 - 631 of 931

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## Question 626

### Question

MCQ▾The average of 12 students is 15. The marks of a student who scored zero were wrongly taken as 18 and average was determined. The correct average marks is________

### Choices

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

a. | 12 | |

b. | 15 | |

c. | 13.5 | |

d. | 14.5 |

## Question 627

## Question 628

### Question

MCQ▾The average weight of the students of a class is 30 kg. 3 new students with the average weight of 36 kg. Having joined the class, the average weight of the class is increased by 3 kg. Find the number of students in the class originally?

### Choices

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

a. | 5 | |

b. | 4 | |

c. | 6 | |

d. | 3 |

## Question 629

### Question

MCQ▾The mean, median and mode of the following numbers

12,24,12,23,24,22,25,26,25,26,26,28,25,22,26,28,29,30,11,12 are________

### Choices

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

a. | 22,26,25 | |

b. | 26,25,22 | |

c. | 22.8,25,26 | |

d. | 25,22,25 |

## Question 630

### Question

MCQ▾Mean of 11 observations is 17.50, if one observation value 15 is deleted. The mean of remaining observations is ________

### Choices

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

a. | 15.75 | |

b. | 17.75 | |

c. | 16.75 | |

d. | 18.75 |

## Question 631

### Question

MCQ▾Two cars start from opposite places on a main road, 150 km apart. First car runs for 25 km and takes a right turn and then runs 15 km. it then turns left and runs for another 25 km and then takes the direction to reach the main road. In the meantime, due to minor break down the other car has run only 35 km along the main road. What would be the distance between the two cars at this point?

### Choices

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

a. | 85 km | |

b. | 75 km | |

c. | 80 km | |

d. | 65 km |