Problem 84E

In the article “ACL Reconstruction Using Bone- Patellar Tendon-Bone Press-Fit Fixation: 10-Year Clinical Results” in Knee Surgery, Sports Traumatology, Arthroscopy (2005, Vol. 13, pp. 248–255), the following causes for knee injuries were considered:

Activity |
Percentage of Knee Injuries |

Contact sport |
46% |

Noncontact sport |
44% |

Activity of daily living |
9% |

Riding motorcycle |
1% |

(a) What is the probability that a knee injury resulted from a

sport (contact or noncontact)?

(b) What is the probability that a knee injury resulted from an

activity other than a sport?

Solution:

Step 1 of 2:

The data about the knee injuries are given.

Activity |
Percentage of knee Injuries |

Contact sport |
46% |

Noncontact sport |
44% |

Activity of daily living |
9% |

Riding motorcycle |
1% |

We have to find,

- The probability that a knee injury resulted from a sport (contact or noncontact),

- The probability that a knee injury resulted from an activity other than a sport.