# Statistics and Probability (KVPY Stream-SA (Class 11) Math): Questions 1 - 4 of 4

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## Question number: 1

» Statistics and Probability » Probability of an Event

Appeared in Year: 2011

### Question

There are 30 questions in a multiple –choice test. A student gets 1 mark for each unattempt question, 0 mark for each wrong answer and 4 marks for each correct answer. A student answered *x* question correctly and scored 60. Then the number of possible value of *x* is

### Choices

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

a. | 6 | |

b. | 5 | |

c. | 15 | |

d. | 10 |

## Question number: 2

» Statistics and Probability » Measures of Dispersion

Appeared in Year: 2011

### Question

Consider an incomplete pyramid of balls on a square base having 18 layers; and having 13 balls on each side of the top layer. Then the total number N of balls in that pyramid satisfies

### Choices

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

a. | 7000 < N < 8000 | |

b. | 8000 < N < 9000 | |

c. | 10000 < N < 12000 | |

d. | 9000 < N < 10000 |

## Question number: 3

» Statistics and Probability » Measures of Dispersion

### Question

Consider an incomplete pyramid of balls on a square base having 15 layers; and having 8 balls on each side of the top layer. Then the total number N of balls in that pyramid satisfies

### Choices

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

a. | 3800 < N < 4000 | |

b. | 3000 < N < 4000 | |

c. | 6000 < N < 8000 | |

d. | 10000 < N < 12000 |

## Question number: 4

» Statistics and Probability » Mean, Median and Mode

### Question

In a city, the total income of all people with salary below Rs. 5000 per annum is less than the total income of all people with salary above Rs. 15000 per annum. If the salaries of people in the first group increases by 10 % and the salaries of people in the second group decreases by 10 % then the average income of all people – (Model Paper)

### Choices

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

a. | Increases | |

b. | Remains the same | |

c. | Decreases | |

d. | Cannot be determined from the data. |