The following frequency table contains the total number of deaths worldwide as a result of earthquakes from 2000 to 2012.
Year Deaths
2000 231
2001 21,357
2002 11,685
2003 33,819
2004 228,802
2005 88,003
2006 6,605
2007 712
2008 88,011
2009 1,790
2010 320,120
2011 21,853
2012 768
Total 823,756
What is the frequency of deaths from 2006 through 2009?
well, the average frequency for those years is
(6605+712+88011+1790)/4 = 24,280
But, as you can see, any linear model will be a pretty poor predictor, since the values are so widely scattered.
But, if you broke the data into groups of 5-10 years, things might even out some.
To find the frequency of deaths from 2006 through 2009, you need to add up the number of deaths recorded for each of those years.
Looking at the table, the number of deaths for each year is as follows:
2006: 6,605
2007: 712
2008: 88,011
2009: 1,790
To find the frequency, you simply add up these numbers:
6,605 + 712 + 88,011 + 1,790 = 97,118
Therefore, the frequency of deaths from 2006 through 2009 is 97,118.