**Causeway**

v (kph) |
---|

40 |

55 |

39 |

68 |

44 |

- __________ Find the sample size n.
- __________ Find the mode.
- __________ Find the median.
- __________ Find the sample mean x.
- __________ Find the sample st. dev. sx.
- __________ Find the sample CV.

Using a Bushnell radar speed gun, the speed of vehicles on two stretches of road were measured on Saturday 23 January 2011 at around 9:30 in the morning.

**Causeway**

v (kph) |
---|

40 |

55 |

39 |

68 |

44 |

- __________ Find the sample size n.
- __________ Find the mode.
- __________ Find the median.
- __________ Find the sample mean x.
- __________ Find the sample st. dev. sx.
- __________ Find the sample CV.

**Hospital**

v (kph) |
---|

23 |

34 |

41 |

29 |

38 |

- __________ Find the sample size n.
- __________ Find the mode.
- __________ Find the median.
- __________ Find the sample mean x.
- __________ Find the sample st. dev. sx.
- __________ Find the sample CV.

v (kph) |
---|

23 |

29 |

34 |

38 |

39 |

40 |

41 |

44 |

55 |

68 |

Use the table on the right for this section of the test.

- __________ What is the level of measurement for the data?
- __________ Find the minimum.
- __________ Find the maximum.
- __________ Find the range.
- __________ Find the midrange.
- __________ If this data is to be divided into
**five**classes, what is the width of a single class? - Determine the frequency and calculate the relative frequency using
**five**classes. Record your results in the table provided.

Class upper limits Frequency F Relative Frequency p(x) **Sums:** -
Sketch a
**frequency**histogram of the data, labeling your horizontal axis and vertical axis as appropriate. - _______________ What is the shape of the histogram?
- __________ Using only the
**Causeway**average and standard deviation, calculate the z-score for a car that was measured at 78 kph. - __________ Using only the
**Causeway**average and standard deviation, is 78 kph a statistically**ordinary***or***unusual**speed based on the z-score?