682篇≤X≤706篇 (2)p=70%∴p(1-p)=0.30×070=0.21 0211,1 1-2=√0001860137 0.7-2×0.0137≤P≤0.7+2×0.0137 67.3%≤P≤72.7% 5.(1) 年份 Y(万千克) 1999 290 2000 -198 2001 2002 2003 3 9 004 5 545 △ 476 70 476=6 a=79.33 ∑=b∑ 330=70b b=4.7143 ∴y=79.33+4.7143 (2)y205=79.33+47143×7=11233(万千克)3 6.82篇 X  7.06篇 ⑵ p = 70%  p(1− p) = 0.30  0.70 = 0.21 ( ) 0.0001866 0.0137 5 1 1 900 0.21 1 1  = =       = −      − − = N n n p p  p 0.7 − 2 0.0137  P  0.7 + 2 0.0137 67.3%  P  72.7% 5.⑴  y = na 476 = 6a a = 79.33  =  2 ty b t 330 = 70b b = 4.7143 y t  c = 79.33 + 4.7143 ⑵ y2005 = 79.33 + 4.71437 =112.33（万千克） 年份 Y( 万千克) t tY 2 t 1999 2000 2001 2002 2003 2004 58 66 74 80 89 109 -5 -3 -1 1 3 5 -290 -198 -74 80 267 545 25 9 1 1 9 25 合 计 476 0 330 70