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Q.1 The random variable X has two properties : (i) the mean of X is 2, and (ii) the mean of X2 in 9. What is the variance of 4X?
(a) 80
(b) 20
(c) 144
(d) 112
Q2. The probabilities that A and B speak the truth independently are p and q respectively.
If they make the same statement, the probability that the statement is indeed true
a) pq/pq+1/2(1-p) (1+q)
b) pq/pq+(1-p) (1-q)
c) pq/pq+(1-p) (1+q)
d) 2pq/pq+(1-p) (1+q)
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