Schaum's Outline of Discrete Mathematics, Third Edition (Schaum's Outlines)

CHAP. 7] PROBABILITY 153

7.81. (a) [2, 6, 10, 12, 24, 36; 1/ 6 ,..., 1 /6];

(b)E(W)=15. No.

7.82. (a) 0.9, 1.09, 1.04; (b) (i) [1, 1, 16; 0.2, 0.5, 0.3], 5.5,

47.25, 6.87; (ii) [1/3, 3, 9; 0.2, 0.5, 0.3], 4.67, 5.21,

3.26.

7.83. μ= 50 / 3 = 16 .67;σ= 10 / 3 = 3. 33

7.84. μ=80;σ^2 =16;σ= 4

7.85. 6 /32.

7.86. n=6,p= 1 / 3

7.87. P≥ 1 − 1 / 8 ≈ 8. 75

7.88. b=

√

10 ≈ 3. 16

7.89. P≥ 0. 75

7.90. σ= 5 /

√

20 ≈ 1. 12