Every year hundreds of thousands of northern fur seals return to their hau outs

Question

Every year hundreds of thousands of northern fur seals return to their hau outs in a certain island in Alaska to breed, give birth, and teach their pups to swim, hunt, and survive in the Bering Sea. U.S. commercial fur sealing operations continued until 1984, but despite a reduction in harvest, the population of fur seals has continued to decline. Possible reasons include climate shifts in the North Pacific, changes in the availability of prey, and new or increased interaction with commercial fisheries that increase mortality. Suppose the following are data on the number of fur seal pups born on the island (in thousands) from 1979 to 2012, where a dash indicates a year in which no data were collected Pups born Pups born Year (thousands) Year (thousands) 1979 170.12 245.93 1996 1980 1997 203.82 1981 179.44 1998 179.15 1982 203.58 1999 1983 165.94 2000 158.74 174.27 2001 1984 1985 182.26 2002 145.72 1986 167.66 2003 2004 1987 171.61 122.82 202.23 2005 1988 2006 1989 171.53 109.96 201.30 2007 1990 1991 2008 102.67 1992 182.44 2009 1993 2010 94.50 1994 192.1 2011 1995 2012 96.83

Explanation / Answer

year deaths 2010 95 2012 97 2008 103 2006 110 2004 123 2002 146 2000 159 1983 166 1986 168 1996 170 1987 172 1989 172 1984 174 1981 179 1998 179 1985 182 1992 182 1994 192 1990 201 1988 202 1980 204 1982 204 1979 246 1991 1993 1995 1997 1999 2001 2003 2005 2007 2009 2011 9 5 7 57 10 3 3 11 0 0 12 3 3 13 NONE NONE 14 6 6 15 9 9 16 6 8 68 17 0 2 2 4 9 9 022499 18 2 2 22 19 2 2 20 1 2 4 4 1244 21 NONE NONE 22 NONE NONE 23 NONE NONE 24 6 6 9 57 10 3 11 0 12 3 13 NONE 14 6 15 9 16 68 17 022499 18 22 19 2 20 1244 21 NONE 22 NONE 23 NONE 24 6

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