1、1. equation 方程式,等式 3 x 2 = 6 is an equation.61 )()( ni ii xfxXEixX1= X2= X3 X4 X5 X61 2 3 4 5 6)(ixff(x1) f(x2) f(x3) f(x4) f(x5) f(x6)1/6 1/6 1/6 1/6 1/6 1/6求一次擲 1 個骰子出現點數和的集中趨勢( 平均數期望值）答案等於 3.5X1= X2= X3 X4 X5 X61 2 3 4 5 6f(x1) f(x2) f(x3) f(x4) f(x5) f(x6)1/6 1/6 1/6 1/6 1/6 1/61/6 2/36 3/6 4/6
2、5/6 6/661 )()( ni ii xfxXEixX1= X2= X3 X4 X5 X6 X7 X8 X9 X10 X112 3 4 5 6 7 8 9 10 11 12)(ixff(x1) f(x2) f(x3) f(x4) f(x5) f(x6) f(x7) f(x8) f(x9) f(x10) f(x11)1/36 2/36 3/36 4/36 5/36 6/36 5/36 4/36 3/36 2/36 1/36求一次擲 2 個骰子出現點數和的集中趨勢( 平均數期望值）答案等於七X1= X2= X3 X4 X5 X6 X7 X8 X9 X10 X112 3 4 5 6 7 8 9
3、10 11 12f(x1) f(x2) f(x3) f(x4) f(x5) f(x6) f(x7) f(x8) f(x9) f(x10) f(x11)1/36 2/36 3/36 4/36 5/36 6/36 5/36 4/36 3/36 2/36 1/36X1= X2= X3 X4 X5 X6 X7 X8 X9 X10 X112 3 4 5 6 7 8 9 10 11 12f(x1) f(x2) f(x3) f(x4) f(x5) f(x6) f(x7) f(x8) f(x9) f(x10) f(x11)1/36 2/36 3/36 4/36 5/36 6/36 5/36 4/36 3/36 2/36 1/362/36 6/36 12/36 20/36 30/36 42/36 40/36 36/36 30/36 22/36 12/362 6 12 20 30 42 40 36 30 22 12 252 /36 252/36=7 答案等於七
