(a) Suppose that the random variable, X, is a number on the biased die and the p.d. f. of X, is as shown below; 1 4 5 6 P(X=x) Find; (1) 1/6 1/6 1/5 k 1/5 1/6 the value of k. (ii) E(X) (ii) E(X2) (iv) Var(X) (v) P(1

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.8: Probability
Problem 32E
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QUESTION 3 (20 MARKS)
(a) Suppose that the random variable, X, is a number on the biased die and the p.d.
f. of X, is as shown below;
X
1
2
3
4
P(X=x)
Find;
()
1/6
1/6
1/5
k
1/5
1/6
the value of k.
(i)
E(X)
(ii)
E(X2)
(iv)
Var(X)
(V)
P (1 <X<5)
10 marks
(b) If events A and B are such that they are independent, and P(A) = 0.3 with P(B) = 0.5;
i.
Find P (An B) and P(AUB)
4 marks
ii.
Are A and B mutually exclusive? Explain.
2 marks
(c) In how many ways can the letters of the word STATISTICS be arranged? 2 mar
ks
(c) State three (3) characteristic properties of a Normal Distribution curve.
2m
arks
Transcribed Image Text:QUESTION 3 (20 MARKS) (a) Suppose that the random variable, X, is a number on the biased die and the p.d. f. of X, is as shown below; X 1 2 3 4 P(X=x) Find; () 1/6 1/6 1/5 k 1/5 1/6 the value of k. (i) E(X) (ii) E(X2) (iv) Var(X) (V) P (1 <X<5) 10 marks (b) If events A and B are such that they are independent, and P(A) = 0.3 with P(B) = 0.5; i. Find P (An B) and P(AUB) 4 marks ii. Are A and B mutually exclusive? Explain. 2 marks (c) In how many ways can the letters of the word STATISTICS be arranged? 2 mar ks (c) State three (3) characteristic properties of a Normal Distribution curve. 2m arks
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