Math

StatisticsSTATISTICS F/BUSINESS+ECONOMICS-TEXTAutomobiles traveling on a road with a posted speed limit of 55 miles per hour are checked for speed by a state police radar system. Following is a frequency distribution of speeds. Speed (miles per hour) Frequency 45–49 10 50–54 40 55–59 150 60–64 175 65–69 75 70–74 15 75–79 10 Total 475 a. What is the mean speed of the automobiles traveling on this road? b. Compute the variance and the standard deviation.BuyFind*launch*

13th Edition

Anderson

Publisher: CENGAGE L

ISBN: 9781305881884

Chapter 3, Problem 74SE

Textbook Problem

Automobiles traveling on a road with a posted speed limit of 55 miles per hour are checked for speed by a state police radar system. Following is a frequency distribution of speeds.

Speed (miles per hour) |
Frequency |

45–49 | 10 |

50–54 | 40 |

55–59 | 150 |

60–64 | 175 |

65–69 | 75 |

70–74 | 15 |

75–79 | 10 |

Total 475 |

- a. What is the mean speed of the automobiles traveling on this road?
- b. Compute the variance and the standard deviation.

STATISTICS F/BUSINESS+ECONOMICS-TEXT

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