# ACET (Actuarial Common Entrance Test) Statistics: Questions 60 - 63 of 81

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## Question number: 60

» Measures of Spread » Variance

### Question

The average of squared deviations from mean is called:

### Choices

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

a. | Range | |

b. | Coefficient of Variation | |

c. | Standard Deviation | |

d. | Variance |

## Question number: 61

### Question

If vertical lines are drawn at every point of straight line in frequency polygon, then by this way frequency polygon is transformed into

### Choices

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

a. | Histogram | |

b. | Width diagram | |

c. | Length diagram | |

d. | Dimensional bar charts |

## Question number: 62

### Question

How many three-digit numbers can be formed by using the digits 1 to 9 if repetitions of digits are not allowed?

### Choices

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

a. | 500 | |

b. | 72 | |

c. | 504 | |

d. | 3024 |

## Question number: 63

» Discrete Random Variables » Standard Deviation

### Question

Which of the following statements relating to the correlation & regression is NOT true?

### Choices

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

a. | The probable error of the coefficient of correlation is 0.6745 times of its standard error | |

b. | The coefficient of correlation between the two variables is the arithmetic average of the two regression coefficients | |

c. | Coefficient of correlation multiplied by the ratio between the standard deviations of the two variables denotes the slope of the regression line. | |

d. | The coefficient of correlation is independent of change of origin and scale. |