如何设计一个方案:尽量减少观测站,而所得到的年降水量的信息量仍足够大.

某地区内有几个气象观测站，根据10年来各观测站测得的年降雨量(如表6)，由于经济原因，要适当减少气象站。如何设计一个方案：尽量减少观测站，而所得到的年降水量的信息量仍足够大。x1x2x3x4x5x6x7x8x9x10x11x12

1991276.2324.5158.6412.5292.8258.4334.1303.2292.9243.2159.7331.2

1992251.6287.3349.5297.4227.8453.6321.5451466.2307.5421.1455.1

1993192.7433.2289.9366.3466.2239.1357.4219.7245.7411.1357353.2

1994246.2232.4243.7372.5460.4158.9298.7314.5256.6327296.5423

1995291.7311502.4254245.6324.8401266.5251.3289.9255.4362.1

1996466.5158.9223.5425.1251.4321315.4317.4246.2277.5304.2410.7

1997258.6327.4432.1403.9256.6282.9389.7413.2466.5199.3282.1387.6

1998453.4365.5357.6258.1278.8467.2355.2228.5453.6315.6456.3407.2

1999158.5271410.2344.2250360.7376.4179.4159.2342.4331.2377.7

2000324.8406.5235.7288.8192.6284.9290.5343.7283.4281.2243.7411.1