25.

Pyramid Lake, Nevada, is described as the pride of the Paiute Indian Nation. It is a beautiful desert lake famous for very large trout. The elevation of the lake surface (feet above sea level) varies according to the annual flow of the Truckee River from Lake Tahoe. Assume that the U.S. Geological Survey provided the following data: Year 1986 1987 1988 1989 1990 1991 1992 1993 Elevation 3817 3815 3810 3812 3808 3803 3798 3797 Year 1994 1995 1996 1997 1998 1999 2000 Elevation 3795 3797 3802 3807 3811 3816 3817 Make a time series graph. 3820 3815 3810 3805 3800 60 68 87 68 88 90 91 92 83 94 95 90 97 98 99 60 O 3820 3815 3810 3805 3800 3795 1 82 90 94 95 95 97 98 99 00 O 3820