a. Show that F(x) is given by Fs(x) = 0 (i) Pr(S≤ 0.5) (ii) Pr(S≤ 1.0) (iii) Pr(S≤ 1.5). x³ - 3(x - 1)³ 6 x³ − 3(x − 1)³ + 3(x − 2)³ 6 1 x < 0 0≤x<1 1

A First Course in Probability (10th Edition)
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Chapter1: Combinatorial Analysis
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2.8. Let X, for i = 1, 2, 3 be independent and identically distributed with the d.f.
x < 0
=
-f
0 ≤ x < 1
x ≥ 1.
Let S = X₁ + X₂ + X3.
a. Show that F(x) is given by
Fs(x) =
0
(i) Pr(S≤ 0.5)
(ii) Pr(S≤ 1.0)
(iii) Pr(S≤ 1.5).
6
x³
F(x)
1
1
3(x - 1)³
6
x³ 3(x - 1)³ + 3(x - 2)³
6
x < 0
0≤x≤ 1
1 ≤ x < 2
2<x<3
x ≥ 3.
b. Show that E[S] = 1.5 and Var(S) = 0.25.
c. Evaluate the following probabilities using the d.f. of part (a):
Transcribed Image Text:2.8. Let X, for i = 1, 2, 3 be independent and identically distributed with the d.f. x < 0 = -f 0 ≤ x < 1 x ≥ 1. Let S = X₁ + X₂ + X3. a. Show that F(x) is given by Fs(x) = 0 (i) Pr(S≤ 0.5) (ii) Pr(S≤ 1.0) (iii) Pr(S≤ 1.5). 6 x³ F(x) 1 1 3(x - 1)³ 6 x³ 3(x - 1)³ + 3(x - 2)³ 6 x < 0 0≤x≤ 1 1 ≤ x < 2 2<x<3 x ≥ 3. b. Show that E[S] = 1.5 and Var(S) = 0.25. c. Evaluate the following probabilities using the d.f. of part (a):
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