1
GATE ECE 2007
MCQ (Single Correct Answer)
+1
-0.3
If $$E$$ denotes expectation, the variance of a random variable $$X$$ is given by
A
$$E\left( {{X^2}} \right) - {E^2}\left( X \right)$$
B
$$E\left( {{X^2}} \right) + {E^2}\left( X \right)$$
C
$$E\left( {{X^2}} \right)$$
D
$${E^2}\left( X \right)$$
2
GATE ECE 2005
MCQ (Single Correct Answer)
+1
-0.3
A fair dice is rolled twice. The probability that an odd number will follow an even number is
A
$${1 \over 2}$$
B
$${1 \over 6}$$
C
$${1 \over 3}$$
D
$${1 \over 4}$$
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