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

Question

Every year hundreds of thousands of northern fur seals return to their haul-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 (thousands) (thousands) Year Year 245.93 1996 1979 170.12 1980 203.82 1997 1981 179.44 179.15 1998 1982 203.58 1999 1983 165.94 2000 158.74 1984 174,27 2001 1985 182.26 2002 145.72 1986 167.66 1987 171.61 2004 122.82 1988 202.23 2005 1989 171.53 2006 109.96 2007 1990 201.30 991 2008 102.67 1992 182.44 2009 1993 2010 94.500 192.1 2011 1994 2012 1995 96.83

Explanation / Answer

Variability of the distribution means the range of the distribution.

The lower limit for the range is 94.5

The higher limit is 245.93

Thus, the variability of the distribution is from 94.5 thousand pups to 245.93 thousand pups

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