How do I calculate the average of some averages? I have the following data:

# of Meetings | # of Attendees total | Avg. Attendees per Meeting |

84 | 1011 | 12.0 |

84 | 866 | 10.3 |

68 | 860 | 12.6 |

How do I calculate the average of these Averages (third column in table above)?

Thanks!

NIRAV