# ACET (Actuarial Common Entrance Test) Statistics: Questions 187 - 191 of 201

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## Question 187

### Question

MCQ▾Find the standard deviation & coefficient of variation when the followings are given-

Variance

### Choices

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

a. | 2,10 % | |

b. | 16,2.5 % | |

c. | 2,5 % | |

d. | 16,5 % |

## Question 188

### Question

MCQ▾In a telephone enquiry system, the number of phone calls regarding relevant enquiry follow poisson distribution with an average of five phone calls during 10-minute time intervals. The probability that there is at the most one phone call during a 10- minute time period is

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 189

### Question

MCQ▾Let X and Y be two events such that which of the following is incorrect?

### Choices

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

a. | ||

b. | X and Y are independent | |

c. | ||

d. | Question does not provide sufficient data or is vague |

## Question 190

### Question

MCQ▾Three coins are tossed simultaneously. Consider the event E ‘three heads or three tails’ , F ‘at least two heads’ and G ‘at most two heads’ . Of the pairs and which are independent?

### Choices

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

a. | ||

b. | ||

c. | ||

d. | Question does not provide sufficient data or is vague |

## Question 191

### Question

MCQ▾If the probability of a defective bolt is . Find the mean and standard deviation for the distribution in a total of 400.

### Choices

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

a. | 40,6 | |

b. | 50,40 | |

c. | 100,40 | |

d. | 40,36 |